Anybody else running a gt42 ?
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Hey.. so what is the significance of the "r" in the 42/76r.. I noticed on Cal's website.. that's the turbo he's using now.. is it 8 sec capable?
Are the 42/78's, 42,80's etc the same turbos then.. but just bigger compressor wheels?
My current 76GTQ spools fast too, but i'm waiting on a transbrake to be installed.
Thanks,
John
Are the 42/78's, 42,80's etc the same turbos then.. but just bigger compressor wheels?
My current 76GTQ spools fast too, but i'm waiting on a transbrake to be installed.
Thanks,
John
JZ 97 SS 1500
Turbocharger Engineer
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Eticket said:
Like said the R is the DBB config. As for the 78mm and 80mm we build them in 2 different forms. We have them in the standard 42 back half and a hybrid back half.
Jose
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Eticket said:
You might have a chance with the R version, but it still seems a little low IMO.
J
JCotton
Guest
John Wilde said:
depending on your convertor, you should be able to spool it. As for the 8 second pass........ that is possible as noted by Cal, but I believe it would have to be a perfect pass, a fairly light chassis and you will have to have all the correct parts to do it. Just because 1 guy does it doesn't mean everyone can. I ran 8's with a 76 4 years ago and others tried with my combo and couldn't..... That's not a knock, just the way it is. If you want to run 8's you may consider something a little larger or shape your combination accordingly.
Jack,
I in no way want to run 8's, anytime soon at least. My problem is that I have a heavy street car, but I'm considering changing to this turbo as I think (could be wrong) it will be much easier on my motor not to have to boost the crap out of it. I figured the increase hp from exhaust efficiency will help me into the mid 9's and not have to run 29-30psi to do it.
Converter: Currently I can footbrake the GTQ and build boost quite easily, so I was trying to get some reference as to how different this turbo (maybe with the smallest exhaust housing) will be.
By the way.. you may or not remember from years ago when you came to TX.. I'm good friends with Greg Kring here in TX.. Asian fellow if that helps.
Thanks guys for all of your input. I think this turbo came out a few months after I bought my GTQ.. go figure.
I in no way want to run 8's, anytime soon at least. My problem is that I have a heavy street car, but I'm considering changing to this turbo as I think (could be wrong) it will be much easier on my motor not to have to boost the crap out of it. I figured the increase hp from exhaust efficiency will help me into the mid 9's and not have to run 29-30psi to do it.
Converter: Currently I can footbrake the GTQ and build boost quite easily, so I was trying to get some reference as to how different this turbo (maybe with the smallest exhaust housing) will be.
By the way.. you may or not remember from years ago when you came to TX.. I'm good friends with Greg Kring here in TX.. Asian fellow if that helps.
Thanks guys for all of your input. I think this turbo came out a few months after I bought my GTQ.. go figure.
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John,
Your dash is my hero!
Your dash is my hero!
Not sure how perfect it would have to be,I ran 8.82 with Cals car on the 5th pass i ran it while doing my lic passes.And this was on Drag Radials, Less tha 10# launch.with low boost in first and most of 2cd.(meaning 20#s or so).The car weighed with me in it 3459 at the scales that say also.And this was done shifting with no Tach!!! He said "listen to the motor and shift when you think its time"JCotton said:
But that Damn "R" version spools like mad!!
So running mid 9 or so should be able to be done with ease.But like Jack said,It does take the right engine,convertor combo to make it all work.
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KLHAMMETT said:Not sure how perfect it would have to be,I ran 8.82 with Cals car on the 5th pass i ran it while doing my lic passes.And this was on Drag Radials, Less tha 10# launch.with low boost in first and most of 2cd.(meaning 20#s or so).The car weighed with me in it 3459 at the scales that say also.And this was done shifting with no Tach!!! He said "listen to the motor and shift when you think its time"
But that Damn "R" version spools like mad!!
So running mid 9 or so should be able to be done with ease.But like Jack said,It does take the right engine,convertor combo to make it all work.
Otto,
What RPM does it need to build boost?
I think Mr. Fell wants to talk to you. :biggrin:
Later,
John,Not to be a pain,But I really dont want to give out info on Cal's car.Maybe he will chime in.Ill tell ya one thing it builds boost on the footbrakeJohn Wilde said:
Call me tomorrow if you want.
I need to call Mr. Fell,See if he still has the weldon pump
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KLHAMMETT said:John,Not to be a pain,But I really dont want to give out info on Cal's car.Maybe he will chime in.Ill tell ya one thing it builds boost on the footbrake
Call me tomorrow if you want.
I need to call Mr. Fell,See if he still has the weldon pump
Otto,
No problem, I will try and give you a call this weekend.
Michael still has the Weldon 2025 and would like to sell it to you.
J
JCotton
Guest
Eticket said:
Hi John,
I vaquely remember, had some fun down there hangin with the TX gang. That was the weekend Greg launched his turbine wheel through the hood.......
The GT42's are exellent turbos and will give you mid 9's easily as well as the spool-up should be good from what you are experiencing with your present turbo. My concern would be your convertor may be a tad on the loose side if you spool so easily now...I just found this post.
The GT 42 is an awesome turbo. With the right combination, I beleive 8.6's could be possible @3400. The TSL class at BG had several cars with this turbo. Ted A went 9.02 with a boost control problem (now fixed), Louie cautiously went 9.24, and Willard B went mid 9's with a leaky wastegate.
chevyII: OC Cantrell went 5.6's in the 1/8th with a 47/80. Paul from LV just bought one from me and ran TSO at BG with it.
John: I have a customer with twins that went 7.02. Also have an NMCA customer with a 42-72 that went 9.34
Eticket: You won't have any problem spooling. My car hits boost BELOW 3000 rpm!
The GT 42 is an awesome turbo. With the right combination, I beleive 8.6's could be possible @3400. The TSL class at BG had several cars with this turbo. Ted A went 9.02 with a boost control problem (now fixed), Louie cautiously went 9.24, and Willard B went mid 9's with a leaky wastegate.
chevyII: OC Cantrell went 5.6's in the 1/8th with a 47/80. Paul from LV just bought one from me and ran TSO at BG with it.
John: I have a customer with twins that went 7.02. Also have an NMCA customer with a 42-72 that went 9.34
Eticket: You won't have any problem spooling. My car hits boost BELOW 3000 rpm!
First of all, don't confuse the GT42 for a 42/76 that some of us are running. It has been mistaken before. The power potential is just beginning to reveal itself as we have not run out of turbo at 152 at 3400+ and ran the 9.02 at low launch boost, ramping the thing real easy. The 1/8th was a crappy 5.80. We are going to hit it a little harder out of the gate and get that 1/8th a little better and expect to see the 8 second light up. I would recommend anybody buying, or thinking of buying this turbo talk to Cal, he has the scoop on most of the different combos running it (His customers), all putting down some very impressive ##'s so far and it is just beginning.
Cal is #1 in my book and has helped me more ways to reach my goal. I set out to run consistant low 9's this spring, I have done that. Now the 8's are too close not to set my new goals on and no componet changes will be necessary, something that I have had to do in the past quite often.
Cal is #1 in my book and has helped me more ways to reach my goal. I set out to run consistant low 9's this spring, I have done that. Now the 8's are too close not to set my new goals on and no componet changes will be necessary, something that I have had to do in the past quite often.
Thanks Cal and Ted,
Cal said GT42 and Ted Said 42/76... what is the difference? I was thinking a 4276 was a GT42 with 76mm wheel, 4202 was 74mm wheel etc etc... Cal you are running the ball bearing version? I was thinking of the journal bearing version. Are the turbos the same except for that fact (same wheels)?
Cal it was good to see you in Oklahoma a few years ago tuning on Callahan's car? You know it's a fun race and we like to see new racers every year. Especially guys that can bump the field.
John
Cal said GT42 and Ted Said 42/76... what is the difference? I was thinking a 4276 was a GT42 with 76mm wheel, 4202 was 74mm wheel etc etc... Cal you are running the ball bearing version? I was thinking of the journal bearing version. Are the turbos the same except for that fact (same wheels)?
Cal it was good to see you in Oklahoma a few years ago tuning on Callahan's car? You know it's a fun race and we like to see new racers every year. Especially guys that can bump the field.
John
Thanks Ted and John. I am running the ball bearing version. It is NOT a must and most people don't have the combination needed to take advantage of it. Ted's car is a non BB with a 1.40 A/R that he is still able to spool easily. You can't apreciate Ted's car unless you've seen it. He has really stepped up his program and I am willing to bet will hit an 8 next time out. In fact, I'll bet someone that there will be at least 3 cars with 42-76's running 8's at Indy. Any takers?
