Well I have just picked up a Greddy T88 turbo for my 20b.

I was just wondering How much hp it would have with a streetport. Any info would be helpfull

I search the site and i didn't find any info.

 

Well, T88s have been known to make 700hp on a 13B-REW engine (Scoot's combo port special), so that would be a ballpark figure to work from.
I would think (guess) that a ported 20B with a suitable fuel setup and ecu would reach that.
Gary
New Zealand

 

I say 500+RWHP with pump gas.

 

I'm thinking 500 +/- 50. The turbine on that is too small for a high horespower 20b.

 

I'd say you should be able to get near the 700hp mark on pump gas with a ported engine, 500-550 max with the stock ports...

 

The guy that i am buying the t88 from doesn't know if he wants to sell it now.

But I can get a Turbonetics T70 turbo from the same guy.

Do you guys think that would be to small for the 20b.

I want to hit the 700hp mark when i am done.

 

Why don't you take a look at compression maps and see what cfm your flowing and the amount of boost you want to run.

Although not running yet, I've got a T-76. Dragon and Igy have a 20B stock ported with a T-76 making approx. 1 Bar of boost at 2K with a smaller exhaust A/R.

It all depends upon the boost curve you want to run. Running a larger turbine will offset the 20B's increased air/heat flow so the turbo isn't spooling up immediately all the time and running out of steam at higher rpms for instance.

Plus, are you trying to run the car for the street, drag, etc? I.e., are you looking for gross high-end HP #'s or streetable boost that comes on quickly and throughout the powerband?

 

Hey,

I have a t66 on a 20B in a series 4 it made 340kw on 6psi and 520kw in 23psi. So work by that the engine was ported and dowled.

Cheers Chris

 

turbos have come a long way. Check out some more efficient Ball Bearing types. With the better flowing Designs of the GT Series Compressors you get more Flow from a similarly sized turbo of yesteryear as well as Ball bearing spooling it up faster due to less resistance. This means you can go very large on the newer Dual ball bearing turbos yet get lower end response and top end power that you desire. The additional price in Nominal. I suggest checking out the GT42 or the HKS T51

 

I'll say it again, the T-88's exhaust side is too small for a 20b, especially if the motor is ported and resleaved. ZoomZoom is right on, those two turbos he suggested are matched incredibly well for a 20B.

 

What gt42 are you guys talking about?

if you go to this page there is a few of them.

http://turbotech.com.au/garrett4.htm

 

Yup those are it. Try this site: http://www.moreboost.org/turbos.htm for exact specs. The GT42 is near the bottom.

 

Turbo 3, What size exhaust a/r housing are you using? I too am going to be using a T-76 but I am undecided between a .96 and a 1.15, since I have access to both, I'll probably try both and use the one I like the most.

 

Well I got a price from a dealer not to far from my place and he told me that the gt42 dual ball bearing wont be out till next year but he gave me a price on the old style gt42 for $1200 cdn. He told be that it isn't a ball bearing turbo. I thought all the gt series were ball bearing.

Well I am going to have a look at it later in the week. The only problem is how am I going to fit it in the fc engine bay.

If it is the same size as this one


https://www.rx7club.com/forum/showth...highlight=gt42

 

The motor is SR Motorsports street-ported. I've got a 1.32 exhaust A/R and a P-trim compressor which is supposed to make more boost than a standard Q-trim. The logic behind that was I would spool the turbo later, say 3-4K, and make 1Bar throughout the powerband without the turbo having to work hard and keeping air temps down. The P-trim thought was on the same principle but I could run around 20psi later on with water injection and still have cool temps, and hopefully stress the motor less thus being more reliable for the long term.

But who knows since I haven't driven it yet and I may want to go with a quicker-spooling turbine later on. Won't know until I try it. Igy and Dragon are running a 0.96 (I think) and are hitting like 1Bar at like 2K. But I believe they built the car for drag and street racing and it has OEM ports as well.

If you have a street port of bigger than I suggest you go with the 1.15 and see how that works. I've spent some time plotting points on a T-76 compression map to see what cfm flow and boost are achievable with our motors. I'd be happy to email it to you if you like just for kicks. It's not entirely accurate because it the map only goes by a standard trim and doesn't say what turbine is being used but it allows for some imaginative thinking on how the curve might come upwards a tad.

 

Odd. I too thought that the GT series were all BB? WTF?

As far as space. Well.........what about manifold that is moved forward abit? As long as the inducer has space then you should be fine, because the exducer isn't as big, right?

I ment to ask earlier, but forgot. What are you going to do about the transmission, clutch, rear diff etc? With so much power, things will start to break.

 

Well i am going to run it with the same stuff i have in there right now and see what brakes and what doesn't. I have an FD trany with a heavy duty clutch and an S4 TurboII Diff. Everything was holding very nice. I ran my car at mosport at 15psi all day long.

 

Turbo 3, if you don't mind go ahead and send those those maps, I was also wondering what boost would be like, man 1 bar @ 2k on a stock motor with a .96 a/r 1st and 2nd gear must be no good on their cars.

 

I still think the exhaust side on the T-frame turbos is too small... stick with the REAL gt42 for optimum performance... it seems to be almost spot on to what a street ported 20b needs to not be choked or suffocated.

 

What's your email?; PM it to me and I'll send it to you, it's in excel format Office Pro 2000.

That's my thought exactly but then they have custom gearboxes/trannies as well in addition so they may be optimizing their powerband a little differently then we're thinking. Their goals are most likely different as well.