searching for 450whp

[spf_lexus]

ok so i keep reading that the lower intake manifold is a real problem area on these engines, why is that and is there a known fix for it?

use the forum and search for Justin_gt8, and he can give u the exact details on how to. The lower manifold chokes off power at 5500-6000rpm and when its replaced with a short runner manifold, it extends the power band to 6000-6500rpm before choking off with no loss in low end hp/tq.

Toyota UZ cams are more expensive versus domestic cams because we need 4 cams versus a single cam for domestics. 4 cam for under a grand is a steal for these. The $2000+ cams are billet machined versus Lextreme's re-ground cams that are plenty stong already.

[4U2QUIK]

as for raising the rev limit, I've been doing research, and I may have found a way to change the rev limiter, but there's problems with doing this. Whatever your last fuel and spark bins are, the get extended from the original rpm to the new one. Whic h could be problematic.

[taka21]

Originally Posted by spf_lexus

use the forum and search for Justin_gt8, and he can give u the exact details on how to. The lower manifold chokes off power at 5500-6000rpm and when its replaced with a short runner manifold, it extends the power band to 6000-6500rpm before choking off with no loss in low end hp/tq.

Toyota UZ cams are more expensive versus domestic cams because we need 4 cams versus a single cam for domestics. 4 cam for under a grand is a steal for these. The $2000+ cams are billet machined versus Lextreme's re-ground cams that are plenty stong already.

i see said the blind man

Originally Posted by 4U2QUIK

as for raising the rev limit, I've been doing research, and I may have found a way to change the rev limiter, but there's problems with doing this. Whatever your last fuel and spark bins are, the get extended from the original rpm to the new one. Whic h could be problematic.

how so? and how are you managing to find this info?

[4U2QUIK]

it's mostly personal knolege acquired over the years from working with electronics and electronic componant developement.

[taka21]

Originally Posted by 4U2QUIK

it's mostly personal knolege acquired over the years from working with electronics and electronic componant developement.

oh ok i thought you might have found a way to read the lexus ecu , and maybe make it tunable like the nissan and honda ecu's

[4U2QUIK]

kinda like nissan, but much more complicated. I'm going to try to use romreader to load the bins.

[Armed_N'_Hammered]

Can anyone tell me how much power a 1uz with stock internals would hold?

89-94 1uz:
95-97 1uz:

Thanks.

[spf_lexus]

89-94 1uz:

500BHP (trans will fail around 350 whp)

95-97 1uz:

300-350bhp (weak rods, trans will fail around 350whp)

[spf_lexus]

I hate the lack of edit post! 95+ engines have 300-350whp not bhp (sorry about that)

[Armed_N'_Hammered]

Thanks SPF

What exactly would fail on these transmissions?

I just finished my trans build last month. Added a cooler, ipt valve body, and lextreme TC. Some of the supra forum members suggest this transmission would be good for 600bhp if raybestos plates were added.