Hello, Ive been putting this question off for a while because it may or may not be a dumb question. I have been reading numerous turbo threads and build for the past 6 months and I came across once or twice someone saying they lowered redline for FI.

I realize that the stock Greddy turbo doesnt flow enough to 9k so people shift earlier. Basically im curious if there is any other reason to lower redline than to run a smaller turbo. I think I have read that it may be better heat management because your not winding out the motor to a high redline while under boost?

My second question is I have read of someone doing Pport intake ports but I was wondering if it was possible to cut Pport exhaust ports in our engine? and either blocking off the side ports or using them as well? I know theres got to be a coolant jacket or something in the way of doing this? Just curious and sorry for dumb questions as info is quite spread around. Thanks.

 

The stress generated on the internal engine components increases substantially as you approach the 9k red line . In a turbo engine you also increase the stress substantially so it makes sense not to do both .

Typical turbo Renesis engines peak at about 7500 so not much point revving much higher than 8-8500 anyway .
And a lot more heat is generated at higher rpm - keeping rpm down assists with this as well.

The port question : of course - anything is possible with enough money/skill/persistence . Easy - no .

 

Thanks Brettus, so do you just shift early or did you actually do a fuel cut at a specific RPM? You using upgraded Greddy turbo right?

 

I limit mine to 8300 via the rev cut (not a fuel cut) .
Running an upgraded Greddy .

 

Awesome. just got to figure out what location I want.

 

shifting early just saves wear. you dont need to do it. Basically as Brettus says! (/shuts up and wanders off)