Orangemagic

iTrader: (2)

How well would a gt-88 garrett turbo work with a forged 347 with 9.5 comp?
The car is just gonna be a weekend driver and mainly a drag car. I'm working on a bigger engine but don't see it being done till mid summer. Its gonna have a built 4l80e trans and 9in rear behind it. Goal is 13-15 psi of boost.
Just looking to see opinions and see if i should go with somethin smaller.

98Z28CobraKiller

iTrader: (17)

It'll work well. It's been done a bunch. Do a search. It will boil down to what specifically you want out of the vehicle. That's on the larger side for a street ride turbo. It will likely start to spool up over 4500 RPM. If you want to be in the boost down low alot, then you need something smaller.

355TurboLT1

iTrader: (11)

I have been pondering the same thing with a PT-88 in my 355 with 8.5-1 compression. I have a 76GTS now and just getting some opinions of what it will be like on the street. The 76GTS in a properly set up car has gone low nines many times. I just get caught up in the dyno numbers

Orangemagic

iTrader: (2)

being an auto I'm not to worried about dyno numbers. I bought the turbo for a dyno queen 408 on my other trans am but things kinda changed. I guess there is always a 50shot or so with a micro switch to shut off around 4-4500rpm. Gonna be kinda hard to tune for that kinda setup though. Is a 88mm turbo gonna pull any harder at 13-15psi putting 600-750hp down?

Phil99vette

iTrader: (11)

With the right engine it would be an awesome 275 radial class, that engine combo could go 5.0-5.1 @ 135-142 in the 1/8 mile. A/w, high compression, race fuel, it would be interesting.

Pro Stock John

iTrader: (34)

47-88? @ 16 psi with a tired 8:1 348 cid went 10.0@139mph... I think you'd go 140+ plus with a fresh engine @ 14-15 psi.

Phil99vette

iTrader: (11)

A properly built LS1 with more compression can handle 30# of boost all day long with the correct fuel and timing. Considering we're running close to 40# of boost, 30 is a walk in the park.

355TurboLT1

iTrader: (11)

Are you using GM MLS head gaskets?

Josh@KY-Turbo

iTrader: (120)

More compression and less boost si the way to go in my opinion. Makes for a better street car. Its just more finiky when it comes to the tune.

My current 408ci Short block is good for 10.4:1 with 72cc heads. Should make for a fun setup. Just gotta decide weather it is gonna be a Big Single or Twins.

MelScrilla

iTrader: (2)

It seems like a forged 347 and a 88 can make good power in a race car. Ford guys have been putting monster turbos on small cube motors for a while and it seems to work well for them. I've seen 100+mm turbos on 331 fords.

DrTurbo

iTrader: (3)

We have a GT88 on a 281 DOHC now......much smaller motor, and its comes up fast. Car is running 5.3's with more to go....

MelScrilla

iTrader: (2)

Do you think bigger turbos work better on the Mod motors because the 4v heads move alot of air or is it just that LS/chevy guys dont really ever do the small cube big turbo combo?

gnx7

iTrader: (28)

What kind of RPM will the GT88 start making boost on a 364ci motor and then make full boost? I'm hoping for around 9.5:1 compression 23x/23x Virginia Speed turbo cam.

DrTurbo

iTrader: (3)

MAkes boost around 3500-4000. Same basic range as all the 88's.