lsx 408 rwhp...is this good?
Thread Starter
Staging Lane
Joined: Apr 2016
Posts: 55
Likes: 1
lsx 408 rwhp...is this good? I recently purchased a 99 z28 from a member here...thanks Sam. 
.
all it needed was a speed density tune and a bigger lid..went with a ftp 98 mm lid..
the car is a 408 with tfs 215 gen x heads, comp .623 .623, .247 .251 dur @ 50 111.
fast 90 ported and nick williams tb. qtp 1 3/4 headers to a 3 inch y 4 inch borlamouth back.
9inch with 4.30 gears and a tick perf stage 2 t56..
brought the car to JM Motorsports in conn. they did everything for me speed density swap and tune...... car made 520@6000 hp and 497@5000 tq car
runs awesome in town and is an animal when needed...is this a good or avg # for a 408? also anything else I can do to make more power thanks guys
.
all it needed was a speed density tune and a bigger lid..went with a ftp 98 mm lid..
the car is a 408 with tfs 215 gen x heads, comp .623 .623, .247 .251 dur @ 50 111.
fast 90 ported and nick williams tb. qtp 1 3/4 headers to a 3 inch y 4 inch borlamouth back.
9inch with 4.30 gears and a tick perf stage 2 t56..
brought the car to JM Motorsports in conn. they did everything for me speed density swap and tune...... car made 520@6000 hp and 497@5000 tq car
runs awesome in town and is an animal when needed...is this a good or avg # for a 408? also anything else I can do to make more power thanks guys
Last edited by Lsx408invt; May 22, 2016 at 03:36 PM.
That's some really good numbers. You could get the intake ported or step up to a fast 102. And ditch the 1 3/4 headers and go with some quality 1 7/8" or even stepped to 2". And get a cutout before the catback.
TECH Addict
Joined: Jul 2013
Posts: 2,189
Likes: 123
From: Portland, Oregon
That is pretty solid.
Especially through the exhaust you have. I would absolutely upgrade to some 1.875"-to-2" stepped tube, or full 2", headers and true dual exhaust. Definitely a true dual system for a stroker.
A bigger intake would help, as well. But a ported Fast90 isn't bad.
Good numbers, though. Good to hear it drives well. Enjoy it.
Especially through the exhaust you have. I would absolutely upgrade to some 1.875"-to-2" stepped tube, or full 2", headers and true dual exhaust. Definitely a true dual system for a stroker.
A bigger intake would help, as well. But a ported Fast90 isn't bad.
Good numbers, though. Good to hear it drives well. Enjoy it.
TECH Addict
Joined: Jul 2013
Posts: 2,189
Likes: 123
From: Portland, Oregon
If you change the whole exhaust system, yes you should get a new tune, but it wouldn't be 100% necessary. The gains will vary from one combination to another, but you can find more than a couple instances where the switch to true duals got an additional 20+rwhp.
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Thread Starter
Staging Lane
Joined: Apr 2016
Posts: 55
Likes: 1
Thanks!! I almost sold the heads and intake...but my tuner said he was even surprised with the way it made power ... After the SD swap its even more of an animal.. No traction in 2nd with 325 m/t drag radials...should be a fun launch at the track
11 Second Club
Joined: Mar 2012
Posts: 1,541
Likes: 15
From: South Florida
Sounds like you got a pretty bad *** z28. Nice! When I switched from the single exhaust to true duals I didn't get a retune. Just dyno pulls to see the increase. +20hp/+20tq. The car loved it.
There is definitely room for more with just bolt ons.
There is definitely room for more with just bolt ons.
