1fast bird

iTrader: (22)

Since I'm 99% sure my twin tc 76's are sold. I'm looking to build around the x 275 class. Thinking about somewhere in the neighborhood of 370-388ci with around 10:1 compression.

I'm looking at a GT47-88 rated at 1600hp or would that choke at higher rpms with those cubes? Also was looking at a GT50-88 and GT55-88. I know the 55 would be best but the 47 is a little cheaper.

Just trying to get things together again.

gimmeluvin

iTrader: (10)

How high are looking to rev?

98Camarod

iTrader: (43)

100% sold, the check's in the mail!

What are competitive times for the x 275 class?

1fast bird

iTrader: (22)

I'm not looking to build a solid roller at this time, but that may change. For now probably no higher than 7500?
To qualify which is all I want to be able to do. I should be in the 5.5x maybe 5.4x range. The top guys are running in the 5.1x's or even 4.9x's. I'm not building it to be competitive, but just to be able to enter a few races to get the feel. The twins would have been good for ODR, but then I have to race with people like Fireball and them retardedly fast guys!!!!

98Camarod

iTrader: (43)

What was your best 1/8th mile time with the twins?

JAX04

iTrader: (17)

I have the EXACT same questions, around here our top "TRUE STREET" which is a 275 class, the top guys are running 4.8 and 4.9s and to qualify 5.teens to .20s.

also 88mm limited class.

Ill be following this thread closley as i wanted to make this thread a few days ago. Best of luck and in for details.

JAX04

iTrader: (17)

Also, id like to add a question to this topic that is relevant as well if you dont mind. If you dont like this question, ill be happy to remove it, but i think it should help


On the topic of the turbocharger, Is it worth more to the racer/car to take a weight penalty for a diffferent frame turbo. IE, large frame is a 100lb weight penatly etc. Atleast thats how our local class works.

so if one wanted to use say a ProMod 88 then they would have to take a weight penalty.

FastBird, Not trying to Hijack, if this is inappropriate ill be happy to delete this question.

1fast bird

iTrader: (22)

I'm not sure the local track would allow them here at all. Besides the ProMod 88's are extremely expensive.

I'm glad I'm not the only one wondering about these turbos. Just good I don't have to make a decision anytime soon

ozws6

iTrader: (25)

I would go with a GT55. I've been looking at those myself.

1fast bird

iTrader: (22)

That's pretty much the direction I'm leaning. Just want to hear what other options there may be.

How's the car running Brian? Wanna sell me another short block?

ozws6

iTrader: (25)

My car has had it's ups and downs. Getting ready to finally make my license passes in a few weeks. I really think my car is cursed, and you don't need any more of my bad luck rubbing off on you. I'll shoot you a pm with the dirty details.

1fast bird

iTrader: (22)

Sorry missed this question.... It went 5.90 @ the 1/8 a few times at 15psi. I'm sure there was 5.7x potential with a little more boost.


Okay I'm leaning towards the 55 but am now looking at the s500sx 88's also.

JAX04

iTrader: (17)

Im gonna bump this back up, is everyone agreeing that the gt55 is the way to go in this limited class?

What would the ideal cubes for a turbo like this??

1fast bird

iTrader: (22)

I have my motor build pretty much nailed down per Shawn at Va Speed. Gonna be a sleeved LS2 and kept at stock cubes (364"). I told him that would be the turbo I'm gonna use and that's what his idea was. I'll take his word for it.

Phil99vette

iTrader: (11)

Use the precision x275 turbo.

b00sted

iTrader: (7)

Yeah, either that x275 turbo(it's a killer 88), or a 91-94 with a reducer if the class allows that. That seems to be what the fast guys do.

JAX04

iTrader: (17)

That is a bad bitch from what ive read! isnt the price tag on that thing like 3500 bucks? or im mis-remembering?

JAX04

iTrader: (17)

I was looking at that option myself, reducers are allowed, just didnt know if with the reducer on the larger turbo, how much benefeit would their be over a turbo that is all but purpose built.

isnt the x275 a large frame turbo?

Ifso, this goes back to a former question i had posted, is it worth it to up the frame size or overall size with a reducer and take a weight penalty?

JAX04

iTrader: (17)

here are the rules.

f. Small Block Forced Induction:

i. Single Supercharger – 3100 lbs.

ii. 88mm Turbo – 3100 lbs.

iii. Mid-frame 88mm Turbo – 3,200 lbs.

iv. Reduced turbo or supercharger – 3,300 lbs.

Professor_speed

iTrader: (8)

I hear the precision x275 turbo is kicking *** and taking names right now. other wise gt55 or s500/88 are good choices all should run the times, its just precision is the best and most expensive one. I would not even consider the 47 the turbine side will be done way before the compressor on an engine that size.