at what rpm do you make full boost of 15lbs on your singe turbo rx7?

i am asking for a friend that is about to make a serious mistake on his fc project.

also if anyone has dyno graphs handy that would be cool.

this guys car is not going to be a drag car and he's talking about getting a t66 or a 62-1 for what would basically be a street car. the lag and power below 5k rpm are going to suffer severely, right?

i am particularly interested in dyno graphs of a to4s VS a t66. (both on normal unported motors)

thanks,

-steve

#s will vary greatly on turbine a/r and trim...

that much is obvious.

i was assuming that people would say what a/r etc...

Exactly, you can't say a turbo is going to be too laggy w/o saying what turbine trim, a/r, and porting....

Exactly, you can't say a turbo is going to be too laggy w/o saying what turbine trim, a/r, and porting.... [/quote]

i think you're missing the point of my post.

i see that you're a mod, but your posts here are still unrelated and less than helpful..

So give us the spec, then. We could help you easily

Exactly, you can't say a turbo is going to be too laggy w/o saying what turbine trim, a/r, and porting.... [/quote]

i think you're missing the point of my post.

i see that you're a mod, but your posts here are still unrelated and less than helpful.. [/quote]

You have to give us some information on the turbo though. For instance, if you said a "O" trim a/r .56 exhaust side with a t-66 front...he'd probably have boost at 2000 rpms https://www.nopistons.com/forums/pub...IR#>/blink.png But if you said a "Q" trim a/r 1.00 exhaust side with a t-66 front on an exhaust ported motor, then expect boost to hit at about 4500 to 5000 rpms.



My t-45s doesn't spool till 5000 rpms, and it's a "street" car.

The type of engine porting is VERY IMPORTANT too !!!! , I get away with using a 1.22 a/r turbine with a 71mm turbine wheel !!!.

Well with any luck, hopefully im going to be spinning a 1. ex a/r with a mild ported exhaust and half bridge (or large street .. havent decided yet) intake port. I expect full boost around 5k ... seems like thats where most people get full boost. Looking at tuning logs and hear say.

Exactly, you can't say a turbo is going to be too laggy w/o saying what turbine trim, a/r, and porting.... [/quote]

i think you're missing the point of my post.

i see that you're a mod, but your posts here are still unrelated and less than helpful.. [/quote]

No you are missing the point LOL. I know whats going to spool when and you still have not told me what the specs are. If you want me to tell you what will work and won't be laggy ect, then ask it and stop beating around the bush.

I had a t-62-1 with 1.0 exhaust, 0.7 comp, on a P trim and it had great low end power, and a **** load of power after 4k rpms that pulled forever.

Just give him a number thats all he wants.



I say 5.

no no no Jim...remember, the magical number is SEVEN https://www.nopistons.com/forums/pub...IR#>/bigok.gif

You should expect sooner with a 1.0. I remember IGY saying his P trim 1.15 housing on a streetport/exhaust port reaches boost at 4500 rpms. I have an HKS wheel(bigger than a "Q" trim) with a 1.04 and I reach boost at 5000~ with a streetport/exhaust port.

that certainly brings a smile to my face https://www.nopistons.com/forums/pub...IR#>/bigok.gif haha

Ive been entertaining the idea of a little "spool kit" to help it along. You have any experience with large turbos + nitrous?

No nitrous(via legal means) on the island of Okinawa. What will you be shifting at?

i'd be shifting right around 8 grand. Its a s5.... has kinda a low redline.



no nitrous on the island huh? bummer... lol

ive been looking at traveling over there, it anything like tokyo?

your friend puts a a/r .84 exhaust housing on either of those turbo's he won't have much boost lag and it will run great. I would suggest the 60-1 because it's cheaper, but the 62-1 will also work well but is a little more expensive for very little gain. Both of those turbo's use a standard shaft and are cheaper to overhaul.. The T66 uses a big shaft and the large A/R compressor housing can cause fitment problems on some manifolds. The big shaft turbo is also more expensive to overhaul and the turbo costs more than 2 times as much as the 60-1. The price of the T-66 would make it cost ineffective for use on a stock ported motor, especially one that won't be raced much even though you can make it spool just fine.