Not performing up to par: potential problem?

mrogo44 · 02-21-2014, 03:22 PM

A little while back, I did a few pulls with a friend who has a GTI (mods listed below), on his stock map. There was about 600lbs of passengers in my 335i, and there was about 450lbs of passengers in his GTI. From about 30 in second, both cars got on the gas at the same time, and his GTI started to pull, but when my friend shifted his car, it lost about 1/3 of a car length, then pulled back the distance and was pulling, not hard, but definitively pulling on my car until both cars let off at about 85-90. I was very surprised how well his car did compared to my friend's GTI. Even my friend was surprised as he had always felt like my car was a good deal faster than his. He then did a pull with me with his car in stage two, and about 450lbs of passengers in my 335i and 550lbs of passengers in my friend's GTI, and he walked me by about 2 car lengths over the same race.
My friend then told me that he did a few pulls with another friend the other night in his X5 (xDrive35i). He was on stock map with only drivers in each car. He said the X5 pulled slightly on him and then the distance was constant.
I feel like my 335i should be faster than him, despite his modifications. When on stock map, his car essentially performs as a stock GTI. Should a stock GTI ever beat a stock 335i? Is there something that needs attention?
His mods: intake, catback exhaust, catless downpipe, and tune.
I have no mods.
Both cars are 6MT.

flexinator · 02-21-2014, 03:40 PM

Buy a tune

Jklad · 02-21-2014, 03:44 PM

Quote:

Originally Posted by flexinator

Buy a tune

Haha, I ordered my Cobb tune the day after a vw gti pulled on me on the highway - never again!!

mrogo44 · 02-21-2014, 03:45 PM

Quote:

Originally Posted by flexinator

Buy a tune

A tune would be great, but I can't get one at this time. Should his car really be that much faster? Is there anything potentially wrong mechanically?

evo335xi · 02-21-2014, 04:04 PM

Makes sense to me to be honest. They are geared shorter and in small sprints they move pretty good. With those mods he will trap over 100 no problem. I'm sure closer to 105mph with their strong midrange also.

dlbrooks18 · 02-21-2014, 04:04 PM

His car is not stock and is lighter.. you need a tune. Yes there is a chance maybe your car has boost leak or something else tho.

flexinator · 02-21-2014, 04:11 PM

With a tune you can run some logs... I know how with a Cobb... Buy one

mrogo44 · 02-21-2014, 04:30 PM

Quote:

Originally Posted by dlbrooks18

His car is not stock and is lighter.. you need a tune. Yes there is a chance maybe your car has boost leak or something else tho.

Does the car exhibit any symptoms for boost leak? What can I check for?

Ingeniator · 02-21-2014, 04:42 PM

Check the IQ valve under the seat. It is usually the problem when street racing a stock car.

dlbrooks18 · 02-21-2014, 05:51 PM

Quote:

Originally Posted by mrogo44

Does the car exhibit any symptoms for boost leak? What can I check for?

Sometimes you can hear if your car is leaking boost and since you are stock you should notice any abnormal sounds from the engine bay as you would not be hearing much if any turbo noise with stock dp's/exhaust/intake, etc. Do you have a diagnostics tool like the Bavarian Technic cable? You can then log to see if hitting boost targets and scan your car for codes. With boost leak sometimes no codes (30ff) thrown so you need to do a pressure test for that.. hope this helps.

MDORPHN · 02-21-2014, 06:38 PM

Quote:

Originally Posted by Ingeniator

Check the IQ valve under the seat. It is usually the problem when street racing a stock car.

Under the seat or behind the steering wheel?

Neil

Sandman614 · 02-21-2014, 06:41 PM

Quote:

Originally Posted by Ingeniator

Check the IQ valve under the seat. It is usually the problem when street racing a stock car.

Quote:

Originally Posted by MDORPHN

Under the seat or behind the steering wheel?

Neil

BuellsterR1 · 02-21-2014, 08:26 PM

Quote:

Originally Posted by MDORPHN

Under the seat or behind the steering wheel?

Neil

That was a joke man..

MDORPHN · 02-21-2014, 10:26 PM

Quote:

Originally Posted by BuellsterR1

That was a joke man..

Yes. Isn't that obvious?

Neil

924er · 02-23-2014, 01:22 AM

When I uninstalled my cobb because of misfires I feel like my car is slow as hell(and possibly injectors :/) , It doesnt have that pull I used to feel when i first bought the car but then again i was probably used to cobb. My car no longer misfires on stock tune, no codes show. You think a data log will show if my injectors are running good? i just had then replaced under warranty 10k miles ago is it possible they are already done?

idrift4wd · 02-23-2014, 01:34 AM

wtf^ why dont you fix your misfires instead of uninstalling tune. That makes no sense.

http://www.e90post.com/forums/showthread.php?t=631829

and no a stock gti shouldnt beat a stock 335i. It might have a better chance from a roll, but even then 335i should pull stock for stock. Not by much though.

Ingeniator · 02-23-2014, 02:21 AM

[QUOTE=idrift4wd;15490442]and no a stock gti shouldnt beat a stock 335i. It might have a better chance from a roll, but even then 335i should pull stock for stock. Not by much though.[/QUOTE]

Not stock from OP

Quote:

His mods: intake, catback exhaust, catless downpipe, and tune.

You can't roll up to a turbo car running high boost and beat it stock. I bet a Juke running 22psi would give a stock 335 a run and that is just sad.

idrift4wd · 02-23-2014, 03:08 AM

[QUOTE=Ingeniator;15490513]

Quote:

Originally Posted by idrift4wd

and no a stock gti shouldnt beat a stock 335i. It might have a better chance from a roll, but even then 335i should pull stock for stock. Not by much though.[/QUOTE]

Not stock from OP

idk he may have just added that but i was answering his question

Should a stock GTI ever beat a stock 335i?

But with I/E/downpipe and tune GTI will probably be faster then a stock 335i. Remember its not about HP, its about power/weight ratio. upgrade the turbos and it will keep up with a tuned 335i

Ingeniator · 02-23-2014, 03:23 AM

[QUOTE=idrift4wd;15490569]

Quote:

Originally Posted by Ingeniator

idk he may have just added that but i was answering his question

Should a stock GTI ever beat a stock 335i?

But with I/E/downpipe and tune GTI will probably be faster then a stock 335i. Remember its not about HP, its about power/weight ratio. upgrade the turbos and it will keep up with a tuned 335i

I wasn't criticizing you. As for added after I remember reading it yesterday but it is pretty buried. I agree power to weight is huge and some GTI Mark IV's are monsters. Anyway back to him needing to check his IQ valve. Now that I think about it I do think that some models have it under the dash behind the glove box.

catcher22 · 02-28-2014, 12:47 PM

Not a good comparison at all, way too many variables. There's no way to tell if your car is mechanically up to par because of a lost race. Codes/scans/etc are the way to go in terms of that.

He's got quite a bit mods against your stock 335i

6MT so one driver could be better at shifting or vice versa. one driver could have just had a bad launch/roll

try racing without passengers/guessing the extra weight. any added weight considerably changes things

go to a strip and do a real test. but buy a tune first!

Danny_Cin · 02-28-2014, 06:36 PM

Hate to beat the horse but... tune then log, tweek log again, grin and blow the doors off that gti... Some mods would obviously help. I recommend bms dci's($100) and a vrsf cp with bov which is also pretty cheap. Mix those with a tune you can afford and you should pull pretty hard. You'd be surprised how efficiently our cars make power with a few mods and a good tune

02-21-2014, 03:22 PM	#1
mrogo44 Enlisted Member 14 Rep 35 Posts Drives: test Join Date: Jan 2012 Location: test iTrader: (0)	Not performing up to par: potential problem? A little while back, I did a few pulls with a friend who has a GTI (mods listed below), on his stock map. There was about 600lbs of passengers in my 335i, and there was about 450lbs of passengers in his GTI. From about 30 in second, both cars got on the gas at the same time, and his GTI started to pull, but when my friend shifted his car, it lost about 1/3 of a car length, then pulled back the distance and was pulling, not hard, but definitively pulling on my car until both cars let off at about 85-90. I was very surprised how well his car did compared to my friend's GTI. Even my friend was surprised as he had always felt like my car was a good deal faster than his. He then did a pull with me with his car in stage two, and about 450lbs of passengers in my 335i and 550lbs of passengers in my friend's GTI, and he walked me by about 2 car lengths over the same race. My friend then told me that he did a few pulls with another friend the other night in his X5 (xDrive35i). He was on stock map with only drivers in each car. He said the X5 pulled slightly on him and then the distance was constant. I feel like my 335i should be faster than him, despite his modifications. When on stock map, his car essentially performs as a stock GTI. Should a stock GTI ever beat a stock 335i? Is there something that needs attention? His mods: intake, catback exhaust, catless downpipe, and tune. I have no mods. Both cars are 6MT. Last edited by mrogo44; 02-21-2014 at 03:58 PM..
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02-21-2014, 03:40 PM	#2
flexinator Captain 88 Rep 639 Posts Drives: 2011 335xi coupe Join Date: Oct 2007 Location: US iTrader: (2) Garage List 2008 335xi [0.00]	Buy a tune
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02-21-2014, 04:04 PM	#5
evo335xi Lieutenant 37 Rep 451 Posts Drives: 335 Join Date: Mar 2013 Location: Ct iTrader: (1)	Makes sense to me to be honest. They are geared shorter and in small sprints they move pretty good. With those mods he will trap over 100 no problem. I'm sure closer to 105mph with their strong midrange also.
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02-21-2014, 04:04 PM	#6
dlbrooks18 Brigadier General 164 Rep 3,735 Posts Drives: e90 335i Join Date: Nov 2008 Location: Los Angeles iTrader: (2)	His car is not stock and is lighter.. you need a tune. Yes there is a chance maybe your car has boost leak or something else tho. __________________ 2008 E90 335
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02-21-2014, 04:11 PM	#7
flexinator Captain 88 Rep 639 Posts Drives: 2011 335xi coupe Join Date: Oct 2007 Location: US iTrader: (2) Garage List 2008 335xi [0.00]	With a tune you can run some logs... I know how with a Cobb... Buy one
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02-21-2014, 04:42 PM	#9
Ingeniator Major 34 Rep 1,093 Posts Drives: 07 335XI(90) 09 135I(82) Join Date: Nov 2013 Location: Fort Mac, Alberta iTrader: (1)	Check the IQ valve under the seat. It is usually the problem when street racing a stock car. __________________ 07 335XI (A008006) 6AT ~94K miles JB4 G5 ISO VSRF DP's 09 135I M (VK80379) 6MT. Race Project car. 1) Install Cobb/piggyback? and Motiv 600 Kit[HTA3076R w/ tial .82] 2) JRZ or Moton suspension. 3) Build high flow intake manifold with multi-port fuel and relocate OFH 4) Build full cage 5) Complete staged twin setup with HTA4205R [w/Tial 1.16] 6) Complete dry sump system
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02-23-2014, 01:22 AM	#15
924er Colonel 351 Rep 2,049 Posts Drives: e92 335i '10 Join Date: Feb 2014 Location: Socal iTrader: (0)	When I uninstalled my cobb because of misfires I feel like my car is slow as hell(and possibly injectors :/) , It doesnt have that pull I used to feel when i first bought the car but then again i was probably used to cobb. My car no longer misfires on stock tune, no codes show. You think a data log will show if my injectors are running good? i just had then replaced under warranty 10k miles ago is it possible they are already done?
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02-23-2014, 01:34 AM	#16
idrift4wd Brigadier General 151 Rep 3,549 Posts Drives: Three Hundred and Thirty Five Join Date: Jul 2010 Location: Yonkers NY iTrader: (0) Garage List 2007 BMW [7.00]	wtf^ why dont you fix your misfires instead of uninstalling tune. That makes no sense. http://www.e90post.com/forums/showthread.php?t=631829 and no a stock gti shouldnt beat a stock 335i. It might have a better chance from a roll, but even then 335i should pull stock for stock. Not by much though. __________________ 12.0 @ 117
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02-28-2014, 12:47 PM	#20
catcher22 Captain 296 Rep 922 Posts Drives: 2008 335xi Coupe Join Date: May 2008 Location: Virginia iTrader: (2)	Not a good comparison at all, way too many variables. There's no way to tell if your car is mechanically up to par because of a lost race. Codes/scans/etc are the way to go in terms of that. He's got quite a bit mods against your stock 335i 6MT so one driver could be better at shifting or vice versa. one driver could have just had a bad launch/roll try racing without passengers/guessing the extra weight. any added weight considerably changes things go to a strip and do a real test. but buy a tune first!
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02-28-2014, 06:36 PM	#21
Danny_Cin Enlisted Member 4 Rep 49 Posts Drives: e92 N54 Join Date: Feb 2014 Location: Mass iTrader: (1)	Hate to beat the horse but... tune then log, tweek log again, grin and blow the doors off that gti... Some mods would obviously help. I recommend bms dci's($100) and a vrsf cp with bov which is also pretty cheap. Mix those with a tune you can afford and you should pull pretty hard. You'd be surprised how efficiently our cars make power with a few mods and a good tune
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