lsx 408 rwhp...is this good?
#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; 05-22-2016 at 03:36 PM.
#3
TECH Addict
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.
#4
silly question.....but if I change headers and exhaust would I need a retune? and is it worth it power gain wise? ...I am waiting on a mod to approve the dyno sheet pic i put up
#5
TECH Addict
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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#8
That's what I was thinking...but it works real well...lots of power down low also.....hey I tried to post my dynograph said it had to b approved by a mod? Something you can do KCS?
#14
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
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#18
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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.