I was dead set on a 4088 until I read this...

[unlmtdndeavor]

Here's a couple more teaser pics for you guys. The first few are the S374 vs a custom pte gt42r. And the others are the 42r, s374, 4094r, and t25











Enjoy. Manifold pics to come soon.

[chavez408]

That t25 looks tempting, I must get it

[jkimes]

unlmtdndeavor would that s374 bolt on to a standard t4 dnp manifold or would you need a top mount to make it fit?

[unlmtdndeavor]

According to DNP's website, it should fit. It shares nearly the same compressor cover as the GT42. There are minor differences, but the overall size is the same. Just make sure your dnp is divided to optimize this turbo's spool characteristics. But I personally will be running a top mount made by a DSMTuners vendor, Full Function (FFTEC). It'll be a few days before all the materials are here, but I'm excited to get started.

[jkimes]

Originally Posted by twicks69

Well, if he is reccomending against the 4-spider, then Shep should use the hardened chromoly cross-shaft with additional oiling grooves; designed, manufactured and sold by Luke Stubbs of Beyond Redline Performance ( Beyond Redline :: Performance Center )- - It is the only one I haven't broken over the years. It has lasted 4 or 5 transmissions, and every time it is taken apart, there is no excessive wear, no discoloration due to heat, and no damage. Great Part! Just talk to Luke, and he can send Shep a cross-shaft if you want to put it in. The only other alternative is a spool or a Quaife; and I would stay away from the spool. Mine just lasted 3 dyno pulls and 20 street miles before having issues -- along with having even crappier turning radius.

Twicks, im not sure what the "hardened chromoly cross-shaft" you were referring to does exactly. Is this similar to a 4-spider or am I completely off-base?

Also, I noticed that a race transmission from dogboxracing.com is only about $1,500 vs. about $2650 for a stage 4 from Sheptrans. Does anyone have experience using one of these transmissions on a car with 600+ ft lbs of torque? Is the shep trans worth the extra 1100 bucks?

[Slippi84]

Originally Posted by jkimes

Twicks, im not sure what the "hardened chromoly cross-shaft" you were referring to does exactly. Is this similar to a 4-spider or am I completely off-base?

Also, I noticed that a race transmission from dogboxracing.com is only about $1,500 vs. about $2650 for a stage 4 from Sheptrans. Does anyone have experience using one of these transmissions on a car with 600+ ft lbs of torque? Is the shep trans worth the extra 1100 bucks?

I see you finally caught up since I been saying to ceck them out and that people use them around here on DD cars about 2 PAGES AGO lol j/k. Trust me they're the real deal.

[1gDSM4g63]

Originally Posted by jkimes

unlmtdndeavor would that s374 bolt on to a standard t4 dnp manifold or would you need a top mount to make it fit?

Why do you want DNP? I'd trust Shearer, Punishment Racing, JM Fab or Straight Line Specialties more to endure and support such a large turbo. And I'm pretty sure if your going as big as a s374 it is not a slip and slide. Big turbos need slimmer radiators and fans, custom fab IC as well as downpipe and intake pipe.

Originally Posted by jkimes

Also, I noticed that a race transmission from dogboxracing.com is only about $1,500 vs. about $2650 for a stage 4 from Sheptrans. Does anyone have experience using one of these transmissions on a car with 600+ ft lbs of torque? Is the shep trans worth the extra 1100 bucks?

I'd say the Dogbox Racing rebuild is actual more comparable to the Shep stage 3 but it you still want to compare it to the stage 4 this is how looks:

Dogbox Racing is $1700 for all the add-ons that the $2650 Shep stage 4 has plus the shift forks, blasted bead and shift rails which Dogbox Racing doesn't offer. That pretty make explain it all. The additionally features that Shep offers is worth the difference and what make it strong.

[Slippi84]

Originally Posted by 1gDSM4g63

Why do you want DNP? I'd trust Shearer, Punishment Racing, JM Fab or Straight Line Specialties more to endure and support such a large turbo.



I'd say the Dogbox Racing rebuild is actual more comparable to the Shep stage 3 but it you still want to compare it to the stage 4 this is how looks:

Dogbox Racing is $1700 for all the add-ons that the $2650 Shep stage 4 has plus the shift forks, blasted bead and shift rails which Dogbox Racing doesn't offer. That pretty make explain it all. The additionally features that Shep offers is worth the difference and what make it strong.

Another 900 for a part that isn't really even the weak link in the system I'll pass. SHep is the man hands down but in my opinion now worh another 900. I'm a local so I may be bias but I have seen these trans first hand hold up to A LOT so take my opinion for what it's worth.

[1gDSM4g63]

Originally Posted by Slippi84

Another 900 for a part that isn't really even the wink link in the system I'll pass. SHep is the man hands down but in my opinion now worh another 900. I'm a local so I may be bias but I have seen these trans first hand hold up to A LOT so take my opinion for what it's worth.

I'm not fight between Dogbox Racing vs. Shep, they both make quality rebuilds. I too have a full built Dogbox Racing w/ 4-spider, etc... that easily holds 500 ft/lbs and 9k shift with no problem on my minor tuning car with a HX40. But when we are talking about a turbo like the GT40R/42R or S372/4 that puts out 700 ft/lbs that is a whole new level and the bead bearing, shift forks and rail make a huge difference.

[twicks69]

Originally Posted by jkimes

Twicks, im not sure what the "hardened chromoly cross-shaft" you were referring to does exactly. Is this similar to a 4-spider or am I completely off-base?

Also, I noticed that a race transmission from dogboxracing.com is only about $1,500 vs. about $2650 for a stage 4 from Sheptrans. Does anyone have experience using one of these transmissions on a car with 600+ ft lbs of torque? Is the shep trans worth the extra 1100 bucks?

The cross-shaft I am referring to, is the shaft that holds the spider gears inside a center differential. Most companies reuse the stock cross-shaft or use a steel shaft and do not have the strength or oiling grooves to really last a long time or handle the abuse.

Also, I have no experience with Dog Box Racing, but I can tell you that you will want to have the upgraded 1/2 and 3/4 shift rails with forged rail ends, and have the 3/4 rail milled to accept an additional shift fork roll pin. Steel shift forks aren't worth it; the Early 1992 ones work just fine.

Using Early 1992 3/4 parts (3rd gear, 3/4 hub and slider, 4th gear) are the strongest I have dealt with that are easily purchased.

I would also reccomend cryotreatment for the input shaft, intermediate shaft and center differential housing at the minimum.

[jkimes]

Originally Posted by 1gDSM4g63

Why do you want DNP? I'd trust Shearer, Punishment Racing, JM Fab or Straight Line Specialties more to endure and support such a large turbo. And I'm pretty sure if your going as big as a s374 it is not a slip and slide. Big turbos need slimmer radiators and fans, custom fab IC as well as downpipe and intake pipe.

1gdsm4g63 I appreciate the input but your not telling me anything I don't already know. I am well aware that the DNP manifold is not the best one out there and has the potential to break with alot of abuse and/or a heavy turbo. However, I'm not a baller (obviously, I drive a DSM and work as a Network engineer ) and right now I can't afford to go spend $1,200+ on a super-bling shearer or full race manifold. I recently got a Home Equity Line Of Credit to do some improvements to my house and since I did all the work myself I have about 7k left-over from the bank loan for my upgrade budget and It looks like I'm gonna have to focus the majority of those funds on my transmission, tcase, axles, and clutch to keep my car from being broken constantly in the future. The DNP mani is proven to work well and only cost's $550 so I'll have to make due with it for now. As for the fan suggestion, I already switched to slimline's when I upgraded my old t25 turbo with the scm6176. I am still using the stock radiator, but I haven't had any overheating problems and I'm pretty sure a 4088 or an s370 will fit without a skinny radiator but I won't hesitate to swap it out if I need to. It looks like I'll be going with a Shep stage 4 tranny with cryotreatment, but I'm still torn over the 4spider issue. Here's what I'm looking at so far for my budget;

Shep Stage 4 w cryo + 4spider Diff: $2600
Borg Warner s372 divided T4 turbo: $1300
PTT twin disk clutch w thick disks: $1100
Bullseye-power 800hp FMIC core: $550
PTE 1600cc injectors : $350
Tial 44mm wastegate: $350
Shearer custom 3.5" 02 elim downpipe: $350
Bushur Racing COP ignition: $350
Tial BOV: $200
MAFT GM translator: $200

[1gDSM4g63]

I'd hold off on the COP until you know you need it plus you will need an ignition control unit with the COP and that could running you anywhere from $400-$500.

[twicks69]

Originally Posted by 1gDSM4g63

I'd hold off on the COP until you know you need it plus you will need an ignition control unit with the COP and that could running you anywhere from $400-$500.

No, you don't. All you need to do is wire in the factory plug to connect to the harness.

No aftermarket ignition box is needed at all.

[unlmtdndeavor]

Ideally you would want a CDI of sort for the coil on plug set up. Is it necessary to get it wired in, no. Will it be better than stock w/o a CDI, thats up for debate.

[We're on Boost]

Edwin, I can't get your "link to dynosheet" to work, for the FP3052 dyno run. Can you get that thing working?

Thanks,
Gary

[jkimes]

So, I'm aiming for 600-700whp+tq and high 9's in my full weight 2g. My car made almost 350hp/tq at a measly 17psi of boost with my current scm6176 on pump gas but it seemed to choke after 6k rpm's. Does the power falling off after 6k on this graph indicate that I need headwork?



Due to some unforseen circumstances my upgrade budget has dwindled to about 5k.
I had originally considered just swapping out the crappy little mitsu hotside on my scm61with a .70 A/R T4 housing for a few hundered bucks, but I would hate to dump extra money into a turbo setup that I know will probably never get me to my goal. The 4088 is awesome, but it's $1800 price tag is a little too steep. According to full-race, an s366 should spool as fast as the 4088 and make as much power as a 4094 and the s372 should spool faster than a 4294 and make 4202 power and both of the BW snails are only around $1300 so I think I'm sold on the borg's over the Garrett snails. Dave at Polk Performance seems to think that my tranny will survive with a larger turbo as long as I baby it since I won't be reving high with the 2.4, but he thinks I need head work. Let me know what you think of this budget expendature.

s366 or s372 - $1300
Bullseye 800hp intercooler - $550
Dark perf. divided T4 mani - $500
Race axles - $400
custom 3.5" o2 elim downpipe - $350
Tial 44mm wastegate - $350
Bushur COP ignition - $350
1600cc injectors - $350
Tial BOV - $200
MAFT - $200
Total - $4500

[Slippi84]

Originally Posted by jkimes

So, I'm aiming for 600-700whp+tq and high 9's in my full weight 2g. My car made almost 350hp/tq at a measly 17psi of boost with my current scm6176 on pump gas but it seemed to choke after 6k rpm's. Does the power falling off after 6k on this graph indicate that I need headwork?



Due to some unforseen circumstances my upgrade budget has dwindled to about 5k.
I had originally considered just swapping out the crappy little mitsu hotside on my scm61with a .70 A/R T4 housing for a few hundered bucks, but I would hate to dump extra money into a turbo setup that I know will probably never get me to my goal. The 4088 is awesome, but it's $1800 price tag is a little too steep. According to full-race, an s366 should spool as fast as the 4088 and make as much power than a 4094 and the s372 should spool faster than a 4294 and make 4202 power and both of the BW snails are only around $1300 so I think I'm sold on the borg's over the Garrett snails. Dave at Polk Performance seems to think that my tranny will survive with a larger turbo as long as I baby it since I won't be reving high with the 2.4, but he thinks I need head work. Let me know what you think of this budget expendature.

s366 or s372 - $1300
Bullseye 800hp intercooler - $550
Dark perf. divided T4 mani - $500
Race axles - $400
custom 3.5" o2 elim downpipe - $350
Tial 44mm wastegate - $350
Bushur COP ignition - $350
1600cc injectors - $350
Tial BOV - $200
MAFT - $200
Total - $4500

Your on the right track with the s372(maybe even a S366) and your goals and with a turbo this big headwork will never hurt. I can't recall do you have a smim and cams already? If not those will be more beneficial to your build. I would never spend $550 on a intercooler though unless it came with piping.