Jackson Racing Supercharger Owners Thread

[CSG Mike]

Originally Posted by PR138

For those of you running a C38 with the high boost pulley on e85, can you comment on how it feels? I keep seeing comments on this forum and elsewhere that this kit is "underwhelming" in pull, but I find it hard to believe a 2800lb car with 370whp is underwhelming in feel or performance. I'm guessing most of those comments are directed towards a fairly stock car with 91 octane.

Can anyone here comment on overall feel at that boost and power level?

The problem is, the power build is so smooth, that you don't really feel it when you do long drawn out pulls. If you're at 6500 rpm and you punch it, you're gonna feel it.

[PR138]

Originally Posted by CSG Mike

The problem is, the power build is so smooth, that you don't really feel it when you do long drawn out pulls. If you're at 6500 rpm and you punch it, you're gonna feel it.

Thanks Mike! What kind of car would you compare an e85 HBP car to in straight line speed? Say you both came out of a turn onto a straight at the same speed, what class of car can a 370whp JRSC car keep up with?

Probably kind of an odd question, but I figure this is the most likely time you've experienced cars around at WOT (rather than a drag strip or anything like that).

[CSG Mike]

Originally Posted by PR138

Thanks Mike! What kind of car would you compare an e85 HBP car to in straight line speed? Say you both came out of a turn onto a straight at the same speed, what class of car can a 370whp JRSC car keep up with?

Probably kind of an odd question, but I figure this is the most likely time you've experienced cars around at WOT (rather than a drag strip or anything like that).

a CARB JRSC would walk your STI. A 370WHP JRSC would walk my flex fuel FA20 WRX, and utterly destroy a GT4.

You should be approximately on par with an automatic M4.

[PR138]

Originally Posted by CSG Mike

a CARB JRSC would walk your STI. A 370WHP JRSC would walk my flex fuel FA20 WRX, and utterly destroy a GT4.

You should be approximately on par with an automatic M4.

Well then... GT4s and M4s trap in the upper 110s to 120mph in the 1/4 mile. That's pretty damn fast and would have to mean that anyone that says it's underwhelming hasn't actually ridden in one at that power level. Thanks!

[Canehda]

So update on the compressor surge sound, it was actually a normal sound to hear i was just being too general by saying it was compressor surge sounding when it was more of a slightly pulsing whoosh sound that is normal...

Just out of curiosity if i switched from a catless UEL to a catless EL would a retune right away be necessary? I was planning on installing the EL in the winter when new engine was going in but just today my UEL header cracked and so Im putting my EL on to at least run car, I know i won't be making peak power but just want to make sure I'm not hurting anything else by doing so!

[CSG Mike]

Originally Posted by Canehda

So update on the compressor surge sound, it was actually a normal sound to hear i was just being too general by saying it was compressor surge sounding when it was more of a slightly pulsing whoosh sound that is normal...

Just out of curiosity if i switched from a catless UEL to a catless EL would a retune right away be necessary? I was planning on installing the EL in the winter when new engine was going in but just today my UEL header cracked and so Im putting my EL on to at least run car, I know i won't be making peak power but just want to make sure I'm not hurting anything else by doing so!

I would, at the minimum, recommend logging to see if everything is okay.

[Lynxis]

Originally Posted by PR138

Well then... GT4s and M4s trap in the upper 110s to 120mph in the 1/4 mile. That's pretty damn fast and would have to mean that anyone that says it's underwhelming hasn't actually ridden in one at that power level. Thanks!

Mathing it out, 370whp on a brz is going to be around 425 crank. At 2800lbs, such a car has a lbs per hp ratio of 6.6. This power to weight ratio is on par with a Charger SRT Hellcat and is faster than the C7 Corvette Z51, AMG C63 and Lotus Evora 400 which are all extremely fast cars in a straight line.

[Deep Six]

My car which weighs under 2700lbs has the C30 high boost with upgraded pump and injectors. Car made about 315 on a Mustang dyno on E75. I've had opportunity to run alongside several of the cars mentioned and I can say that on the straights it will keep pace with most V8 Camaros and Mustangs but still gets walked by Vette's, GTR's GT3's etc.


On the street is another story as my wife's APR tuned TTS will absolutely obliterate my FRS in any low speed roll or dig. It simply runs off and hides but I have done a 3.9 Vbox 0-60 with it.

[86 South Africa]

Originally Posted by Lynxis

Mathing it out, 370whp on a brz is going to be around 425 crank. At 2800lbs, such a car has a lbs per hp ratio of 6.6. This power to weight ratio is on par with a Charger SRT Hellcat and is faster than the C7 Corvette Z51, AMG C63 and Lotus Evora 400 which are all extremely fast cars in a straight line.

A bit simplistic though. Traction, gear ratios, tyres..... etc... all play a roll.

Great that our cars are so light though cos every add HP makes a bigger difference than the heavier competition :-)

[Lynxis]

Originally Posted by 86 South Africa

A bit simplistic though. Traction, gear ratios, tyres..... etc... all play a roll.

Great that our cars are so light though cos every add HP makes a bigger difference than the heavier competition :-)

Yes, it is very simplistic but I pray someone with this power level isn't trying to put it down with the OEM 215 Michelins lol.

[CSG Mike]

Originally Posted by Lynxis

Mathing it out, 370whp on a brz is going to be around 425 crank. At 2800lbs, such a car has a lbs per hp ratio of 6.6. This power to weight ratio is on par with a Charger SRT Hellcat and is faster than the C7 Corvette Z51, AMG C63 and Lotus Evora 400 which are all extremely fast cars in a straight line.

AUC works against us.

[gtengr]

Originally Posted by Lynxis

Mathing it out, 370whp on a brz is going to be around 425 crank. At 2800lbs, such a car has a lbs per hp ratio of 6.6. This power to weight ratio is on par with a Charger SRT Hellcat and is faster than the C7 Corvette Z51, AMG C63 and Lotus Evora 400 which are all extremely fast cars in a straight line.

When there are dramatic differences in weight, velocity becomes a relevant factor in the power to weight ratio because pure horsepower is more important when the wind resistance begins to exceed the rolling resistance. Assuming 14.4 lbs/hp in a 2800 lb car and a 3800 lb car, that gives 200 hp and 264 hp, respectively. If we assume both cars have roughly equal aero, and 100 mph is sapping 50 hp from each, then the 2800 lb car now has a power to weight ratio of 18.7 lbs/hp and the 3800 lb car is at 17.8 lbs/hp based on power available to accelerate the car. As velocity increases, so would the gap in the power to weight ratio.

[wootwoot]

Science.

[bfrank1972]

Originally Posted by gtengr

When there are dramatic differences in weight, velocity becomes a relevant factor in the power to weight ratio because pure horsepower is more important when the wind resistance begins to exceed the rolling resistance. Assuming 14.4 lbs/hp in a 2800 lb car and a 3800 lb car, that gives 200 hp and 264 hp, respectively. If we assume both cars have roughly equal aero, and 100 mph is sapping 50 hp from each, then the 2800 lb car now has a power to weight ratio of 18.7 lbs/hp and the 3800 lb car is at 17.8 lbs/hp based on power available to accelerate the car. As velocity increases, so would the gap in the power to weight ratio.

Yup, although compared to many cars the 86 is pretty aerodynamic out of the box, so it suffers this effect less than other lightweight cars. Also inertia is a greater burden to heavier cars at low speed when you get past a certain power level (all other things being equal).

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