What turbo based on CFM of engine
 

According to my calculations, my engine flows between 110 and 125 cfm at about 85% VE.

This is for a 750cc-900cc motorcycle engine.

Motor will be spun to no more than around 8500rpm.

What do you guys think and where can I find that turbo that you suggest?

Boost I want to keep below 10psi at the most.

Re: What turbo based on CFM of engine
 

t25 or really small t3

Re: What turbo based on CFM of engine
 

t25 exh housing with t4 comp housing ftw. t25/t4 ;)

Re: What turbo based on CFM of engine
 

Some kind of RHB5 would probably work well.

Re: What turbo based on CFM of engine
 

Re: What turbo based on CFM of engine
 

What exactly should I be looking at on not2fast.com

Also, is there a chart that show what vehicles those turbos came in.

Thanks.

Re: What turbo based on CFM of engine
 

bump ;D

Re: What turbo based on CFM of engine
 

You are in over your head if you can't figure out how to pick out a turbo for your bike. The link above will tell you just about everything you need to know about turbos. Read the whole site.

Re: What turbo based on CFM of engine
 

I have actually been over that site numerous times and read everything that I can get my hands on over there. I didn't see a calculator that would help define my turbo requirements. I guess I should be looking at compressor maps to see what would be right for my combo.

As far as being in over my head, you are speaking a bit out of school. I was just looking for some poignant advice from members.

Does anybody have a list of production vehicles that came with a particular turbo.

Re: What turbo based on CFM of engine
 

http://www.not2fast.com/turbo/glossary/turbo_calc.shtml

Are you saying that won't tell you what kind of turbo you need? If you think that calculator isn't more than enough to pick a compressor wheel, then you should stop now and look for a local shop to build the kit for you. Start going through the process and when you come up with specific questions, then post up and I'll answer them to the best of my abilities. www.not2fast.com has all the information you would need to pick a turbo and build a basic turbo setup.

Re: What turbo based on CFM of engine
 

Looks like if I bore the bike out and go with bigger cc's that I could use a T3-45 on the big side and if I stay near stock displacement a T3-40 trim would be right on the the money in the middle efficiency island at 72%.

It is right in between the T3-40 and 45 right now.

Do you guys have any ideas on what vehicles those turbos came in and recommendations on a blow through carb?

Re: What turbo based on CFM of engine
 

Double post...sorry

Re: What turbo based on CFM of engine
 

Re: What turbo based on CFM of engine
 

Good boy. Now we can move on. What are your power goals? Where do you want the power to be? Basically you need a compressor that can flow between 7-15lb/min and because you aren't using an intercooler, you are going to want to keep the pressure low so the intake temps are low. So figure you are shooting for about 1.5 PR.

So basically find any turbo that can flow from 7-15lb/min at 1.5PR and you are good to go. It really is that simple. compressor efficiency means more to you than a typical person as most people don't care because the intercooler takes care of a lot of the temperature increases. I'd shoot for around 70% compressor efficiency on average.

Upon a quick glimpse, turbos to look for:

Garrett:
GT12 - Big low end and midrange. Up top will be limited.
GT15 - Midrange and powerful top end.
T3 45 Trim - Laggy but top end should be ridiculously violent due to the larger turbine wheel. I wouldn't suggest it.
T25 - There are a ton of different varieties of these. Any of them are probably okay but probably a bit on the large side.

KKK:
I'm not familar with this line to be honest with you. VW/Audi guys will be though. I'm sure something like a K03 could work. There are a couple different ones though. You probably want the smallest of the bunch.

Mitsubishi:
They also came with a T25 they might be a bit big.
TD04-9b - Really solid JY choice. Come off 3000gts and Stealths. I think this is what I'd look for.

Re: What turbo based on CFM of engine
 

On the boost side of things I was looking for the 7-9 range max given that the bike is air/oil cooled and I don't want to have to run race gas or H2O/meth injection.

1.5 PR is right at 7lbs with a slightly large cc motor (836cc...the most popular kit)

I am guessing that the compressor map going up sharply to the right indicates a strong ramp up rate for boost?

The GT12 map that I found looks like I will be right at the edge of the choke line

That map for the TD04-9b looks right on the money. Puts me right in the middle once you convert CFM to cubic meters.

I will start looking for them now. Thanks a bunch.

Great...dodge stealths and Mitsu 3000gts. Looks like they might have been on the 1.6L colt as well.

Re: What turbo based on CFM of engine
 

Now....how about carberation....? ???

Re: What turbo based on CFM of engine
 

draw-through holley 2300

Re: What turbo based on CFM of engine
 

Is there any credence to the issues of driveability and possible compressor damage with a draw through carburetor?

Re: What turbo based on CFM of engine
 

carbon seals if you smoke on off-throttle deaccel..

blow through is where its at.

Re: What turbo based on CFM of engine
 

It appears that stock carb can be converted to blow through applications. I am sure the secret is somewhere on this board so I will start looking. Looks like the dude in the post below me is in the same predicament.

you need a small turbo,, get the smallest you can find,, anything for a 2 liter or more is likely to never spool on a bike engine.

900cc is close to 1 liter.. look for a turbo off a gas burning car of 1 liter.. it should be perfect for the bike.

this thread is 3 years old........................