Is your bet based on just installing the headers or installing and adjusting the afr's? Also .............. coated and/or wrapped or no insulation? Oh, so many variables.

 

Yep, it's all directly related to the impeller type/size and backpressure at the bung located immediately after the kats.

 

I am not a racer but I do have S-Car-Go headers, S-Car-Go carbon air intake, rebuilt my stock turbos with garret ball bearing turbos and a GReddy Boost Controller. I have NO lag. It is hard not to have the boost even with a light touch to the pedal. I am very pleased with the S-Car-Go upgrade I have.

 

CJV thanks for clarifying the gear ratios used, great choice. The stock 996 TT 1st. gear is 3.818 993GT2, Clubsport and others came with a taller 1st. gear (3.15) and 2nd. (2.0). The 996 GT2 is the same as the 996 TT I believe.

 

Jean,

I don't remember all my gear ratios off the top of my head, but I'm sure they are posted somewhere in the cjv/s car go thread.

 

Kevin,
Please elaborate.

 

what were the numbers???? It cant be that bad! Spill it!

 

come on Ken...give it up!

 

You guys ought to know by now what Ken does he does correctly. You don't simply bolt headers on and drive away. Ken also does great reports when he is finished.

 

Kevin,

I don't know the details of Ken's set up and depending on his set up, yes your suggestions are two distinct options. I have also used other options with very good success. Namely, insulating the heads and tuning the motor to the headers.

I have run smaller and larger headers on my car. My problem was a little different. The smaller headers produced better power in the lower 4000 rpm range, however lost power after compared to the larger diameter headers.

I found insulating the headers was like finding free power. In addition, I'll bet the S Car Go headers are making the motor run leaner. Add fuel and the power will come way up.

I don't know what Ken is running for an intake, however another way of taking advantage of the S Car Go headers is to use the S Car Go carbon fiber intake. This intake by itself will produce another 25 hp and coupled with the headers will further eliminate the stall you refer to.

 

Would the EVO/IA stage 4 GT turbos meet this description? Aren't they a K16/24 hybrid?

Mike

 

I have a pair of headers from kevin.... very nice....

 

Kevin,

I believe we all need to sit tight and see what Ken comes up with. The stock headers even ported, start to lose ground to S Car Go type headers at about 560 hp.

To simply bolt on each header and see which one makes more power is moot. Without tuning the ECU and removing weak links prior to the heads for each exhaust it's impossible to know which system makes more power. Moreover, power is not necessarily our ultimate goal, otherwise we would have used straight through design. It makes alot more sense to measure exhaust gas backpressure and monitor boost pressure during a dyno pull. Measuring backpressure is a straight forward indication of how good an exhaust is, and looking at the boost we also get an idea of the throttle response characteristics and the source of the added power.

 

yups.... he knows what's what...

 

YES I AGREE- i had the k-24s race versions and anything after apprx. 5500 rpms the car was out of air.. and I actually felt it. Kevin knows... My dyno run proved it as well.