RuSkY RaCeR

i have a garrett 1.15 hotside and .60 comperssor, to4b, it starts spooling at 3k and gets 3psi at 3.5k, it stays at 3 psi the whole way up to 7.5k. i dont know what the problem is. the wastegate is closed and i cant make any boost. i might have gotten too big of a turbo and the car doesnt have enough power to spool it. it would be great if someone had ideas of what is wrong and point me in the right direction

IAN

iTrader: (3)

Sorry I can't help you since I have similar problems. Been trying to figure this out for like 3 weeks. I'm down to possible changing the turbo out.

Bond

T66 Qtrim on 81 a/r, i see positive at 2k and hit 20.4 lbs last night computer said 4400 rpms.
This is with a rough tune, so i believe it will hit even sooner. Also all my readings were good at 20 so im movin it up this weekend, hope it holds.

mike

importrx7

T-78 with an upgraded wheel i get full boost by 4300-4500 don't watch it that close, to busy watching the road..

SyderJL

Can you post your mods with this ^ ?? The T72.
That spools isanely fast!

Justus

SyderJL

^ Nevermind your running a 3 rotor . . . .
Nice setup though

RuSkY RaCeR

ok i got a new turbo..... garret .86 ar on the hot side and .7 ar on the compressor.... hopefully this one works better. can anyone tell me if this will work on a stock engine (not ported). thanx

Silver7

This is for the guys with serious spool problems... When I first went single my turbo would make good boost until it started to heat up. After I boosted it a few times the boost pressure would start to fall off until it barely made 1 PSI. I took it out and tried another one and it worked fine. I assume the bearings were not clearanced properly since the wheel spun freely while everything was cold, but binded up when the turbo became hot. My point is, there is a good chance the turbo may not have been built properly. If you have not yet swapped out your turbo for a known working turbo, then I would strongly recommend it.

I have a T04B 60-1, custom manifold and a street ported motor. I usually check my spoolup in 5th gear since it's easier to read in 5th.

positive boost pressure is immediate
10 psi by 3100
15 psi by 3300/3400

With my old T04E I made
10 psi by 2800
15 psi by 3100/3200

ROTARYFDTT

iTrader: (4)

20B helps a bit with spool

t-von

iTrader: (8)

I don't remember ever seeing these numbers posted? Have you finally gotten your new tranny?

MARTIN

on a .7 comp sside and .96 backside, I make 10 psi no later than 4500 rpms stock ports, 4" thick IC, and about 24" length. Boost time also depends on gear. Also, I cannot hit more than 5 or 6psi in first gear. Second gear hits 10 instantly, only if I am boosting in first..It also doesnt decelerate as fast as other turbos I seen. You can let go of the gas, shift like your cruising, and not worry about building boost again..Its almost like having a ball bearing turbo, w/o the cost.. O and BTW its a Master Power T70( not that gay **** they sale online).

Havoc

T04e 60-1 (.7 Comp & 1.15 hot side)

starts to spool about 3500
about 7psi at about 4000
14psi at 4800

340 Rwhp - Stock ports

Slammedblk7

iTrader: (7)

Master Power T-70, 1bar of boost in 1st gear by 6200rpm.

P.S...needs more tuning.

MARTIN

ports ? mods

widebody2

slammed for christ's sake you can't do 1st gear. I think we should all try to stick with the same gear since that makes a huge difference...I mean 5th gear I'm spooled by like 3k....1st gear takes a while, thank god, since the car would be even more useless in 1st if it didn't.

kkk stage 2
boost response by just under 3k
full boost by 3750 in 3rd
1.1 AR stock port

chuck8313BTSDS

Interesting thread, but I don't understand the "full boost by ####rpm" with out posting a boost number. sorry.

Here's mine. 88 turboII 4th gear, 3.9 gears, 235/45/17 tires. .96 a/r p-trim, "street" port intake with "large" exhaust ports.
Start from a roll at 3000rpm in 4th gear, 1 bar at 3800rpm and 1.3bar at 4700rpms. AFR's in the eye burning/plug fouling range. Boost controller/waste gate problems so I have'nt hit "full boost" yet, 1.5/1.7
chuck

IAN

iTrader: (3)

nice. That is quick boost. This is what I expected out of mine but barely develope any boost now let alone the lag issues. But I had two rebuild places say its good and two say its bad. Dam. Now I have to pull it off again.

Thanks for the info.

MARTIN

Does the wheel spin freely ? If it is kinda hard to rotate then I say you got a bad turbo. It should be free to spin and should continue to spin if you were to spin it by hand, definately should not stop abruptly..

pistonsuk

Setup:

4inch inlet 60-1 w/. P-trim .84 divided hotside

On: 3mm 13BT w/low comp rotors w/ very large streetport, FMIC, 3inch exhaust wg plumbed back in

10psi around 3200 rpm
15psi by 3800 rpm
18 psi by 4k

i think these #'s could be brought down considering the hotside a/r with higher comp rotors or smaller exh ports (less over lap)

justin

RuSkY RaCeR

Im going to put the turbo in this weekend. the thing with my turbo is that it spins freely when it is hot or cold.. it only builds up to 3.5 psi at nearly 7000 rpm.. and doesnt want to make anymore boost. that is the problem. it wont make any boost. the turbo that is in right now is garret t04b with 1.15 hot and .6 compressor.. i think the hot side is too big( which is why id doesnt want to make more boost) i think? im also having problems with all the vacuum lines.. maybe thats the problem... i didnt buy a kit so i didnt get any instructions on what to do with the rats nest.. if anyone has a link to where i can get some direction, on what to do with all the lines please post it here or email me at ruracer18@netzero.com that will be a great help to me.

Silver7

you can pretty much pull out the entire rats nest. All you need for boost control is a vac line from your UIM to your WG. If you don't have anything hooked up to your WG then you should overboost. Therefore, I doubt yoru lines are messed up. Sounds like a bad turbo or a WG that's stuck open. You should be able to make more thatn 3 psi even if you havea 1.32 turbine on there.

IAN

iTrader: (3)

It does spin. But slows down immediately after letting it go.

Its pretty much hopeless since I had it to one turbo shop and they said it was good by looking at it but all of the shops want $550cdn + tax to pull it apart to make sure its ok.

Sounds like some people on this post have the same problem as me

MARTIN

It shouldnt slow down immediately. is it kindad hard to spin?? what type of bearing does it come with??

RuSkY RaCeR

the wastegate is really shut. there is no carbon seut in it or outside of it when i took it off. the wastegate isnt connected to the exhaust, its got an external pipe. it would mean that the car would be really loud, which it isnt. i guess the turbo on it is bad, but i had a tuner guy look at it and he said that it spun fine. i dont know... im just going to put the new turbo in this weekend and hope it works. thanx for your help

o, silver7 what do you mean just pull out the entire rats nest? do i plug any thing up? there are some kind of sensors under the intake manifold to which all the vac lines go.. can you send me some pics or a link to step by step instructions, because i have a hard time figuring out the whole mess. thanx.
this is my first turbo modification to anything and nothing seems to work. i wish i had another car facing mine with the same set up so that i could compare and assemble it. lol


also during the idle when the car is still cold, it runs fine, as soon as it warms up, it wants to die out, and it shuts off. the rpms drop down to like 400 and eventually the car shuts off when its just sitting there

RuSkY RaCeR

just finished putting in the turbo and took a test drive. wow, so much power at 7 psi. i changed the turbo to a .7 compressor and .86 hotside, garret. the turbo works great. i start spooling at 3k and at full boost (9 psi right now) at 4k... all the problems got fixed, the car runs fine, now i gotta find a filter that fits a 4 inch intake on the turbo... if anyone has any ideas pm me.