What Turbo for my goals (8s and 6 speed), other questions as well
02-15-2005, 09:47 AM
#21
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If your looking for 1000rwhp, a PTE-88 will do that if your trying to stick with a T4 frame. If your wanting to move up to a T6 frame turbo then the PT91 is your best bet. Once you start getting to the larger units though lag starts becoming an issue. For a full blown race car with a transbrake its not an issue, but if this car will be a manual, then it will be an issue between gear shifts.
02-15-2005, 09:54 AM
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Originally Posted by JZ 97 SS 1500
If your looking for 1000rwhp, a PTE-88 will do that if your trying to stick with a T4 frame. If your wanting to move up to a T6 frame turbo then the PT91 is your best bet. Once you start getting to the larger units though lag starts becoming an issue. For a full blown race car with a transbrake its not an issue, but if this car will be a manual, then it will be an issue between gear shifts.
02-15-2005, 10:04 AM
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Yeah, a PTE88 will be close to its limits to produce those #'s, but your asking alot if you are wanting to stick this unit on the road, keeping it streetable and still wanting 1000+rwhp. The 91 would be your best bet to make the big #'s but you will sacrifice spool up with that unit. Now their are alternative turbos out there. We have used the Y2K-88BB (1000+rwhp)and it makes huge power and spools fairly quickly even for a large frame unit (T6 flange). Also the GT47-88 is a good unit, but spools slower then the Y2K. The good thing about the Y2K is the physical size is not huge like the 91 and other thumper units. So you may want to take that into consideration.
02-15-2005, 10:26 AM
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Don't get me wrong I am not looking for 1000rwhp driving on the street. I am looking for 700rwhp on 93 octane on the street (or close to) and maybe a high 9 second pass on 93 octane. The 1000rwhp will come with 116 octane fuel and 20+ psi. When you say spool time what do you consider good 3000-4000rpm? Like I said before I would think the 4" stroke will help spool the turbo pretty well. I will look into some of these options.
02-15-2005, 11:01 AM
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A PTE-88 will hit peak boost around 4000rpms with a large cube motor like that. The larger units will hit peak boost even higher. A 91 will probably reach it somewhere in the 5100-5300rpm range. Since your running a manual tranny you don't have the luxury of having a stall load the engine, so spool up is slower. But you can always downshift 
02-15-2005, 12:27 PM
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Originally Posted by Pro Stock John
What is your FIRST goal buddy? 
Start there, you are going around and around in the last four posts.
Start there, you are going around and around in the last four posts.
Not really. I want a streetable 700rwhp with 93 octane and low boost and 8 second capability on 116 octane and high boost. This was my goal from the get go, I just didn't explain it. Bottom line is that if I have to sacrifice a little streetability to get it I will.
02-15-2005, 12:28 PM
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Originally Posted by JZ 97 SS 1500
A PTE-88 will hit peak boost around 4000rpms with a large cube motor like that. The larger units will hit peak boost even higher. A 91 will probably reach it somewhere in the 5100-5300rpm range. Since your running a manual tranny you don't have the luxury of having a stall load the engine, so spool up is slower. But you can always downshift
Thanks. One question, can I get boost from the motor by just reving it up with no load (i.e. like pre-launch at the strip with a manual) or does there have to be a load on it (like foot breaking an auto)?
02-15-2005, 12:32 PM
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The BIG Stuff 3 has a two step limiter, is that what you are talking about. I don't see how that would produce load though. Coule you explain? Thanks.
02-15-2005, 01:06 PM
#32
My setup goal is 9's and I'm going for 1100hp. I think your going to be really stretching it get those kind of #'s and drive the car on the street. Not to mention the cost of replacing tranny's and clutches.
02-15-2005, 01:07 PM
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Originally Posted by BLk01SS
My setup goal is 9's and I'm going for 1100hp. I think your going to be really stretching it get those kind of #'s and drive the car on the street. Not to mention the cost of replacing tranny's and clutches.
02-15-2005, 01:52 PM
#34
Originally Posted by DAPSUPRSLO
The BIG Stuff 3 has a two step limiter, is that what you are talking about. I don't see how that would produce load though. Coule you explain? Thanks.
02-15-2005, 02:20 PM
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Originally Posted by smokinHawk
the two step, pulls the timing at a certain rpm like a second rev limiter as to not combust all the fuel, once the fuel hits the hot exhaust manafold it ignites and spools the turbo, giving you boost at the line
02-15-2005, 02:51 PM
#36
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Originally Posted by JZ 97 SS 1500
If your looking for 1000rwhp, a PTE-88 will do that if your trying to stick with a T4 frame. If your wanting to move up to a T6 frame turbo then the PT91 is your best bet. Once you start getting to the larger units though lag starts becoming an issue. For a full blown race car with a transbrake its not an issue, but if this car will be a manual, then it will be an issue between gear shifts.
I would not get consumed with the 'lag' you might get on the street, if you make like 600rwhp at 5000 rpms is your car gonna be laggy?
I had a 422ci, 4.10's, 4500 stall, and 28" slicks, the car was crazy on the street. And it only went 11.02@123. I have since made a few blasts on the street with my car and my passenger turned white but I thought it was okay. I was on slicks and did not get traction until about 100mph.
02-15-2005, 03:00 PM
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Originally Posted by Pro Stock John
I think you can't go wrong with Jose's suggestion.
I would not get consumed with the 'lag' you might get on the street, if you make like 600rwhp at 5000 rpms is your car gonna be laggy?
I had a 422ci, 4.10's, 4500 stall, and 28" slicks, the car was crazy on the street. And it only went 11.02@123. I have since made a few blasts on the street with my car and my passenger turned white but I thought it was okay. I was on slicks and did not get traction until about 100mph.
I would not get consumed with the 'lag' you might get on the street, if you make like 600rwhp at 5000 rpms is your car gonna be laggy?
I had a 422ci, 4.10's, 4500 stall, and 28" slicks, the car was crazy on the street. And it only went 11.02@123. I have since made a few blasts on the street with my car and my passenger turned white but I thought it was okay. I was on slicks and did not get traction until about 100mph.
Now that's an animal. 4500 stall and 4.10s would turn anybody white if they weren't driving.
I am assuming you meen the t91 option would be the way to go. This motor will spin about 7000-7200 so I don't think not hitting full boost until 5000 will be a problem. Like you said, 600rwhp will be plenty fast at the 5000 rpm range and when I put the race gas in and hit the 20+ button, forgedaboudit.
02-15-2005, 03:16 PM
#38
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I say put the biggest unit on you can stand, thats always been my rule of thumb. I am use to my supra which doesn't hit full boost till 4300-4500rpms, and its cool with me. It does effect ET's though and thats why if your system is laggy and your running a manual then it will suffer some. With an auto though, well thats no longer an issue.
Jose
Jose
02-15-2005, 03:26 PM
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Originally Posted by JZ 97 SS 1500
I say put the biggest unit on you can stand, thats always been my rule of thumb. I am use to my supra which doesn't hit full boost till 4300-4500rpms, and its cool with me. It does effect ET's though and thats why if your system is laggy and your running a manual then it will suffer some. With an auto though, well thats no longer an issue.
Jose
Jose
02-15-2005, 03:29 PM
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Yes it will drop down between shifts, even with the larger parts and greater inertia. I have a customer with a mustang, 6spd and a T91. Car is an animal when on boost, but when he shifts, their is an inherent delay for the turbo to come back up on boost. Its a little annoying, but the way the car pulls when its on the boost makes you forget...hehe.
Jose
Jose