[86merc]

Originally Posted by Tiago@VRSF

The heatsoaking issue when doing quick subsequent drag pulls is going to be a constant issue with all intercoolers. Unless there's ambient air flowing through the core, you're not going to be able to cool it down in between quick runs.

If heat soak is an issue between runs a nitrous spray bar for the intercooler is a good option. But I doubt many would go that far on a street car.

[Antetokounmpo]

Originally Posted by 86merc

If heat soak is an issue between runs a nitrous spray bar for the intercooler is a good option. But I doubt many would go that far on a street car.

Just spray some cold water on it between runs. Autox guys do it all the time. Helps a good amount.

[86merc]

That does work. The issue with doing that is many tracks will not let you run if they see water dripping off the car. So while it does work, you have to be sure to have enough time to let it dry.

I can't tell you how many times I have seen people letting their car run with the A/C running. To pull up and be directed back to the pits due to water dripping off the A/C dryer and evap case drain. lol

[Bimmer 808]

Originally Posted by Tiago@VRSF

Thanks for posting the logs!

I don't think you'll find any intercooler in the 7" range that's capable of only increasing temps 23 degrees through a 2-5 gear pull although these are the highest temps I've seen so far with this intercooler. For example here's an independent log provided recently by a member of this forum who seems to be running the same amount of boost as you. 12 degree rise, 99f at 2k rpm in 3rd to 111f at 6.1k rpm in 5th.

The heatsoaking issue when doing quick subsequent drag pulls is going to be a constant issue with all intercoolers. Unless there's ambient air flowing through the core, you're not going to be able to cool it down in between quick runs.

Thanks for the log Tiago, but it's not comparable to the abuse I put the HD through at NFZ. It's also from an N55 I believe. Regardless, yes 23 degrees is admirable.

[LMB335IS]

Originally Posted by Bimmer 808

Thanks for the log Tiago, but it's not comparable to the abuse I put the HD through at NFZ. It's also from an N55 I believe. Regardless, yes 23 degrees is admirable.

It's a N54. A 500whp/550wtq one pushing 22psi tapering to 18 at 6k rpm. I've done quite a few 1/2 mile events on the 7" and have another one the first weekend of May. No IC made will help heatsoak when you're not moving. It's the nature of air to air IC's unless you spray. You have very limited control of the IAT at the beginning of a run. It's all controlled by ambient and driving/traffic situation.

My 7" consistently showed 35-40 degree rise across 3 gears pulls in dozens of logs and it didn't matter if the IAT was 60 or 105 at the start of the pull. The HD, at least with my very limited data sample so far shows a 10-12 degree rise over the same pull. To me that's a huge difference and totally justifies the purchase. I'll have more to add later in my own thread but I'm very interested to see what I get in 6 gear pulls at a 1/2 mile event.

[Bimmer 808]

Originally Posted by LMB335IS

It's a N54. A 500whp/550wtq one pushing 22psi tapering to 18 at 6k rpm. I've done quite a few 1/2 mile events on the 7" and have another one the first weekend of May. No IC made will help heatsoak when you're not moving. It's the nature of air to air IC's unless you spray. You have very limited control of the IAT at the beginning of a run. It's all controlled by ambient and driving/traffic situation.

My 7" consistently showed 35-40 degree rise across 3 gears pulls in dozens of logs and it didn't matter if the IAT was 60 or 105 at the start of the pull. The HD, at least with my very limited data sample so far shows a 10-12 degree rise over the same pull. To me that's a huge difference and totally justifies the purchase. I'll have more to add later in my own thread but I'm very interested to see what I get in 6 gear pulls at a 1/2 mile event.

Thanks LMB. Is that 500hp on stock turbos? I'm interested to see if your 10-12 degree rise holds up at the 1/2 mile as well.

[LMB335IS]

Originally Posted by Bimmer 808

Thanks LMB. Is that 500hp on stock turbos? I'm interested to see if your 10-12 degree rise holds up at the 1/2 mile as well.

Yep, stock snails. Lol, it may be wishful thinking to think I'm only going to get a 10-15* rise over a half mile. Realistically I'd be happy with 25-30*. I don't know how NFZ works but the Wannagofast events I do usually entails a single 100 car staging lane for the Clayton GA or a 4 lane staging for Ocala FL with the GA event just being brutal for heatsoak. Ocala is a little better but it's Florida and cool weather is hard to come by. To make matters worse, I have a DCT and I can't just put in neutral and push it with the engine off. The engine needs to be on to get it in neutral and leave it there.

PS Going through my 1/2 miles log real quickly, I see that the 7" was fairly consistent with a 50-60* rise in IAT through a 1/2 mile.

[BQTuning]

I use to walk my car in the lines with hood open to reduce heat soak. Didn't start the car till I was next to pull up to the tree.

[LMB335IS]

Originally Posted by ********

I use to walk my car in the lines with hood open to reduce heat soak. Didn't start the car till I was next to pull up to the tree.

Lol. I just went out and figured out how to get it in N and leave it there without the motor running. I've had it 4 yrs

[Julian2485]

Originally Posted by LMB335IS

It's a N54. A 500whp/550wtq one pushing 22psi tapering to 18 at 6k rpm. I've done quite a few 1/2 mile events on the 7" and have another one the first weekend of May. No IC made will help heatsoak when you're not moving. It's the nature of air to air IC's unless you spray. You have very limited control of the IAT at the beginning of a run. It's all controlled by ambient and driving/traffic situation.

My 7" consistently showed 35-40 degree rise across 3 gears pulls in dozens of logs and it didn't matter if the IAT was 60 or 105 at the start of the pull. The HD, at least with my very limited data sample so far shows a 10-12 degree rise over the same pull. To me that's a huge difference and totally justifies the purchase. I'll have more to add later in my own thread but I'm very interested to see what I get in 6 gear pulls at a 1/2 mile event.

What tune are you running to get that power on stock snails and what mods do you have ?

[LMB335IS]

Originally Posted by Julian2485

What tune are you running to get that power on stock snails and what mods do you have ?

The guy two posts up has been tuning me for 2-3 yrs now(BQ).

It's easier to tell you what mods I don't have. I have everything but upgraded turbos.

[hellokitty]

Originally Posted by LMB335IS

The guy two posts up has been tuning me for 2-3 yrs now(BQ).

It's easier to tell you what mods I don't have. I have everything but upgraded turbos.

Hpfp only or PI/TBI?

[LMB335IS]

Maxed out lpfp and hpfp. Lol

[Julian2485]

Originally Posted by LMB335IS

Maxed out lpfp and hpfp. Lol

E70 tune and your running on stock fuel pumps lol ?

[LMB335IS]

Originally Posted by Julian2485

E70 tune and your running on stock fuel pumps lol ?

I never said stock fuel pumps. It was a Stage 1 which worked really well but now it's a Stage 2 bucketless. Problems solved.

E content varies. Most of the time it's closer to E60 but sometimes I can find myself closer to E70. No big deal. Pumps weren't crashing but they were at the low end of what I consider acceptable. Trims were maxed.

[Julian2485]

Originally Posted by LMB335IS

I never said stock fuel pumps. It was a Stage 1 which worked really well but now it's a Stage 2 bucketless. Problems solved.

E content varies. Most of the time it's closer to E60 but sometimes I can find myself closer to E70. No big deal. Pumps weren't crashing but they were at the low end of what I consider acceptable. Trims were maxed.

Ok got you thanks

[brakthru]

Hey guys,

Anyone notice a power increase with the vrsf 7 hd coming from stock. If so, where in the power band? Also, any noticeable lag or slower initial acceleration when crushing the throttle until boost picks up, pressure drop and such. Im seriously considering this intercooler. Im fbo aggressively tuned running Mishimito 5 inch. This intercooler does well with the added power gained back throughout the power band and cooling until muti gear pull through 3rd, 4th etc 30° temp increase. 5°-10° iat increase 3rd gear pull.

Any dyno charts out there comparing stock to the vrsf 7 hd?

Thanks

[Jeff@TopGearSolutions]

Originally Posted by brakthru

Hey guys,

Anyone notice a power increase with the vrsf 7 hd coming from stock. If so, where in the power band? Also, any noticeable lag or slower initial acceleration when crushing the throttle until boost picks up, pressure drop and such. Im seriously considering this intercooler. Im fbo aggressively tuned running Mishimito 5 inch. This intercooler does well with the added power gained back throughout the power band and cooling until muti gear pull through 3rd, 4th etc 30° temp increase. 5°-10° iat increase 3rd gear pull.

Any dyno charts out there comparing stock to the vrsf 7 hd?

Thanks

There will be a good improvement overall throughout the power band and especially in the upper RPM range going from the Mishimoto 5" to the 7" HD.

Not only is the intercooler bigger, but it's a more efficient and denser core. It will be less prone to heat soak and it will also get rid of the restrictive stock connections for improved flow and performance.

I don't believe there are many stock comparisons (mainly cause anything is better then stock) but there is this:

[brakthru]

Originally Posted by Jeff@TopGearSolutions

There will be a good improvement overall throughout the power band and especially in the upper RPM range going from the Mishimoto 5" to the 7" HD.

Not only is the intercooler bigger, but it's a more efficient and denser core. It will be less prone to heat soak and it will also get rid of the restrictive stock connections for improved flow and performance.

I don't believe there are many stock comparisons (mainly cause anything is better then stock) but there is this:

Sounds good!

I'm down to 2 possible intercoolers. The vrsf and evo 2 performance. The evo says there's less pressure drop than stock so no loss in velocity. I think they both cool well. Which one performs the best with power throughout the rev range? Which one is easier to install? Is the pressure drop noticeable with vrsf?

[brakthru]

Has the vrsf 7 in hd been discontinued? Just bought stage 2 turbos maybe running them at 500 to 550hp. I don't want to max turbos out. Is the 7.5 in competition replacing the hd? I really don't want such a big and heavy intercooler but it looks like my choices are slim for the price of a good intercooler. Anyone have personal experience with AMS? Maybe that's a better option for my power level. No track. Just street use.

This was originally posted in the 1series forum but it should've been here.
Thanks

[Tiago@VRSF]

The 7.5 Competition HD has replaced the 7". The weight increase is minimal in comparison to it's predecessor (4 lbs difference) and it can support up to 750whp without breaking a sweat which greatly outperforms any standard 7".

[brakthru]

Originally Posted by Tiago@VRSF

The 7.5 Competition HD has replaced the 7". The weight increase is minimal in comparison to it's predecessor (4 lbs difference) and it can support up to 750whp without breaking a sweat which greatly outperforms any standard 7".

So about 25 lbs? Any additional pressure drop or lag with these?