Should I make more intake changes??
Thread Starter
Joined: Jan 2002
Posts: 398
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From: St. Charles, IL
Should I make more intake changes?? I have a 383 in my 00 Z28. I mainly autocross and road race the car. The engine was built for a broad power band and a lot of torque. I have a 236/236/111 .550/.550 cam, stock de screaned maf, ported ls6 intake and ported and smoothed stock TB.
The question I have is " Is it worth going to a larger TB, MAF, and or different intake manifold???" If so, how many HP are we talking?
I went with the lift I am running because the car spends a LOT of time between 4500-6800 rpm and I don't want to change valve springs every month. Also, the car puts over 400 ft-lbs to the wheels from 3200-6000 rpm.
Thanks for the info.
Brad
The question I have is " Is it worth going to a larger TB, MAF, and or different intake manifold???" If so, how many HP are we talking?
I went with the lift I am running because the car spends a LOT of time between 4500-6800 rpm and I don't want to change valve springs every month. Also, the car puts over 400 ft-lbs to the wheels from 3200-6000 rpm.
Thanks for the info.
Brad
TECH Addict
Joined: Jun 2005
Posts: 2,660
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From: England
well you should see more power, but whether it will make any odds to the performance of the car is a totally different matter.
Not doubting your ability, but I seriously doubt your car is as fast as it could be driven. Driver and suspension/drivetrain mods will most likely make the biggest difference. But of course they don't show up on the dyno.
Also loosing some weight off the car should help.
That's how a Lotus Exige 1.8 with 190bhp is quicker than a 400bhp 6.0 Corvette C6 Z51 around a race track.
Not doubting your ability, but I seriously doubt your car is as fast as it could be driven. Driver and suspension/drivetrain mods will most likely make the biggest difference. But of course they don't show up on the dyno.
Also loosing some weight off the car should help.
That's how a Lotus Exige 1.8 with 190bhp is quicker than a 400bhp 6.0 Corvette C6 Z51 around a race track.
Thread Starter
Joined: Jan 2002
Posts: 398
Likes: 0
From: St. Charles, IL
There is always room for improvement with driving ability.
However, I took 2nd in points for the year and have consistantly had the 2nd fastest time of the day at all the tracks I have raced at this past year. The only car that beat me won the 2003 One lap of America race. It is a C5r powered Z06 with well over $100k in mods. He has huge tires all the way around, a big functional wing like the C5R cars and weighs in a lot less than me. I run in A-Race which is an unlimited class with over 3.0L displacement NA or 2.5 forced induction. The class has a lot of gutted mustangs with over 390 cubes. The 3rd place car is a 93 GT with a 408 and fulley gutted. I have full interior and weigh in at 3800 w/driver. I don't plan to gut my car and enjoy using my AC. There is really no other suspension mods left to do to my car.
I have only been doing this the last couple years so I know there is more time to be shaved off. I used to be a drag racer prior to this. Any more power would be nice as long as it doesn't take away from the low and mid range power.
Brad
However, I took 2nd in points for the year and have consistantly had the 2nd fastest time of the day at all the tracks I have raced at this past year. The only car that beat me won the 2003 One lap of America race. It is a C5r powered Z06 with well over $100k in mods. He has huge tires all the way around, a big functional wing like the C5R cars and weighs in a lot less than me. I run in A-Race which is an unlimited class with over 3.0L displacement NA or 2.5 forced induction. The class has a lot of gutted mustangs with over 390 cubes. The 3rd place car is a 93 GT with a 408 and fulley gutted. I have full interior and weigh in at 3800 w/driver. I don't plan to gut my car and enjoy using my AC. There is really no other suspension mods left to do to my car.
I have only been doing this the last couple years so I know there is more time to be shaved off. I used to be a drag racer prior to this. Any more power would be nice as long as it doesn't take away from the low and mid range power.
Brad
TECH Addict
Joined: Jun 2005
Posts: 2,660
Likes: 14
From: England
might be worth trying to find some dyno graphs of the 90/90 FAST setup.
I suspect it will move the torque a little higher up the rpm range if I'm honest, although I would expect gains across the entire range. If you've got the dosh I say go for it.
Sounds like a fun race series. Although BIG cubes and BIG tyres don't always win races.
In the late 70's (76+) Bob Tulius was very successful in the SCCA Trans Am Championship. He was running a V12 Jagaur XJS. Keeping the stock 5.3 litres and 500-550bhp he still beat the large 454ci Corvettes which had upto 100bhp more and often weighed less. Tulius was a very good driver, but the handling of the car was probably one of the biggest factors. However the XJS may have been quick, he also prepped a Triumph TR8 for the same series, it only had a 4.0 litre Rover V8 with 360bhp, but due to weighing a fair bit less than the XJS it was faster around every track. It was actually banned from the series as it would have embarressed the large engined cars.
I suspect it will move the torque a little higher up the rpm range if I'm honest, although I would expect gains across the entire range. If you've got the dosh I say go for it.
Sounds like a fun race series. Although BIG cubes and BIG tyres don't always win races.
In the late 70's (76+) Bob Tulius was very successful in the SCCA Trans Am Championship. He was running a V12 Jagaur XJS. Keeping the stock 5.3 litres and 500-550bhp he still beat the large 454ci Corvettes which had upto 100bhp more and often weighed less. Tulius was a very good driver, but the handling of the car was probably one of the biggest factors. However the XJS may have been quick, he also prepped a Triumph TR8 for the same series, it only had a 4.0 litre Rover V8 with 360bhp, but due to weighing a fair bit less than the XJS it was faster around every track. It was actually banned from the series as it would have embarressed the large engined cars.
I would look at the TPiS 90mm oval TB mod for the LS6 intake. It seems to provide the best "under the curve" hp & tq numbers and the peak numbers are close to the Fast setup.
