Boosted_Speed is Going Big Turbo =)

[Boosted_Speed]

Looks nice... I want a log mani to replace my stocker for the tiem being bust the exhaust shops around here wotn touch it.

dam really? shops around you are refusing work? lol

 

[HondaEat-R]

Just because a turbo hits full boost later in the RPM range doesn't mean it won't break your transaxle.... The fact of the matter remains, you're jamming a s*** ton more air in your motor, making a bunch more power regardless of RPM range, and just because there's a 500-800 RPM difference between the two, you think things will be fine based on that blind assumption ? It's obvious that some people on here never learn...ever from others mishaps or mistakes. You're willing to blow $1,300 on a turbo you don't need, but neglecting the parts you do need, even with the stock turbo. I understand the logic that you're basing this all on, but it's just not sound.

 

[yudkib]

lmao can someone retitle this thread "mazdaspeed 2003.5 build round 4"?

youll be fine with all youre looking at if you keep the boost low. if you want to be safe, keep it around 325 whp. the tranny starts having trouble a little north of 350whp from what i recall. but the LSD needs to be addressed immediately. get a new diff and have it welded immediately, or buy an mfactory. seriously, the LSD is trash, and as soon as you go north of 250whp you cant even reuse the one included with the car, because the metal gets pitted and the weld shears off.

 

[HondaEat-R]

lmao can someone retitle this thread "mazdaspeed 2003.5 build round 4"?

youll be fine with all youre looking at if you keep the boost low. if you want to be safe, keep it around 325 whp. the tranny starts having trouble a little north of 350whp from what i recall. but the LSD needs to be addressed immediately. get a new diff and have it welded immediately, or buy an mfactory. seriously, the LSD is trash, and as soon as you go north of 250whp you cant even reuse the one included with the car, because the metal gets pitted and the weld shears off.

I'd be careful of using HP #'s as markers for estimated failure times. My car at 15psi (gt25) took every tooth off of the stock 3rd gear... Not to mention the PAR gear debacle, which had it's own seperate issues.

 

[Outlawstar98]

I'd be careful of using HP #'s as markers for estimated failure times. My car at 15psi (gt25) took every tooth off of the stock 3rd gear... Not to mention the PAR gear debacle, which had it's own seperate issues.

That Par issue is because its Built for a NA IMHO.

kool dino has PAR gears and he has no issues.

 

[StealthWyvern]

dam really? shops around you are refusing work? lol

yep, really. The only way they will mess with a exhaust mani for my car is to weld the cracks in the stocker. Which they cant even garante that the weld will hold and not just come back again later on. They say it had to do with some legal emissions bs and we dont even have emission testing down here.

 

[Ricktalife]

HondaEat-R: Yea I got yelled at for saying pretty much what you said. I just don't understand the whole "lack of funds" reason to risk breaking more s*** and causing you to spend even more.

lmao can someone retitle this thread "mazdaspeed 2003.5 build round 4"?

youll be fine with all youre looking at if you keep the boost low. if you want to be safe, keep it around 325 whp. the tranny starts having trouble a little north of 350whp from what i recall. but the LSD needs to be addressed immediately. get a new diff and have it welded immediately, or buy an mfactory. seriously, the LSD is trash, and as soon as you go north of 250whp you cant even reuse the one included with the car, because the metal gets pitted and the weld shears off.

Whaaaat? I've heard people shred gears just shy of 250whp.

 

[yudkib]

maybe i misremember. that would probably be a "the GT25 spools and applies too much torque too quickly" issue. its entirely possible that im wrong - but id love to see a source on the 250whp barrier.

doesnt rich run stock engine/tranny internals aside from welding the diff and he was pushing 280 whp? the fact is as soon as you forge or upgrade your turbo you immediately move the "bottleneck" to the tranny. some people might shred them at 250, some at 350. but once you upgrade the turbo and engine its the tranny that sucks out.

hey hondaeat-r when you broke your tranny (the first time haha) what RPM were you at? and id figure 15psi on the 25 would put you at about... 225?whp

 

[XoX1de]

hey hondaeat-r when you broke your tranny (the first time haha) what RPM were you at? and id figure 15psi on the 25 would put you at about... 225?whp

15psi on gt25 will put out around 240-250whp, with around 280-290 ftlb of torque.

 

[Outlawstar98]

Re trans issues with gears usually cone up around 300-350hp.

 

[Ricktalife]

Now that I think about it 250whp does sound a little low, so I may have been thinking LSD failure. I still think 350whp sounds a little high, but hey if it really is possible that sounds good to me lol.

 

[yudkib]

you can wreck the LSD at 250whp no problem. people wrecked that diff at 170 at the crank. and if you just drop the trans and weld the one that came with the car, its not a foolproof solution. people break welded ones at 250whp too. the only way to do it right is to get it welded right out of the box, or just skip that nonsense and get mfactory.

 

[Ricktalife]

I wish there was an easy way to check if the LSD is welded. Though with the parts I've taken off my car it would be a miracle if it was. Guess I'll just pray it doesn't go out until I get a replacement.

 

[yudkib]

yeah me too, i also wish there was an easy way to determine if im forged. the owner before me definitely sunk enough money into the car that either is possible. the remnants of his work are clear, though none of the sweet stuff he had was on it when i got it.

 

[HondaEat-R]

15psi on gt25 will put out around 240-250whp, with around 280-290 ftlb of torque.

Somewhere around there sounds right, maybe a bit less, depends. Never dynoed.

 

[HondaEat-R]

The quick spool of our turbo DEF does put shock on the tranny at lower RPM, but I'm saying that throwing a pretty damn big turbo on there and justifying it by saying that it won't be an issue due to the later spool, is a joke. I don't know man, I'm just not a gambler. Look around, and you'll find people shredding gears on the stock turbo. I'm all about a sweet build, but build a strong car, then add power, not the other way around.

 

[HondaEat-R]

maybe i misremember. that would probably be a "the GT25 spools and applies too much torque too quickly" issue. its entirely possible that im wrong - but id love to see a source on the 250whp barrier.

doesnt rich run stock engine/tranny internals aside from welding the diff and he was pushing 280 whp? the fact is as soon as you forge or upgrade your turbo you immediately move the "bottleneck" to the tranny. some people might shred them at 250, some at 350. but once you upgrade the turbo and engine its the tranny that sucks out.

hey hondaeat-r when you broke your tranny (the first time haha) what RPM were you at? and id figure 15psi on the 25 would put you at about... 225?whp

Bryan,

Whether people buy it or not, both times I broke my tranny, I was driving like a granny. I seriously baby my car compared to most.


My PAR issues were due primarily to the pitting of teeth. Like I've said before, I spent hours on the phone with Gerard and even Haysum @ PAR, determining the cause of the failures. The breakage that I experienced wasn't due to excessive force, it was due to excessive wear.

I'm not trying to talk people out of upgrading turbos, I just disagree with order and logic. I just think when you build something, it should start with a strong foundation, not bragging rights due to a big ass turbo.

 

[yudkib]

i dont doubt it at all for the PAR stuff. they said it themselves that the fluid etc was the issue. what happened when you blew your stock tranny (or multiple trannys)? were you driving like a granny when those went?

and im all about upgrading the trans and everything that comes with it. im not telling him to run 30 psi. a good build is a responsible one and a GT30xx with minimal mods does not fall within the realm of a responsible build, but he can drive the car without shredding the gears if he doesnt act like an idiot.

 

[HondaEat-R]

I agree with you, but where we may differ is that I feel....If you're putting a big turbo on like that...you're going to drive like an idiot, or at least drive damn hard. Otherwise you'd be happy with how fast the stocker can get you to 65mph. I'm getting old.

 

[yudkib]

holy hell, yes you are. im going to put a discotater on eventually but im smart enough to keep that at moderate boost. i dont know if everyone else is that smart. but yeah, youre getting old.