Rebuild Or Replace: M35 Turbo

[Dunc]

Also keep in mind your goals when you're trying to determine what 'sort' of high flow to get; you don't want to end up with a lag monster if it's going to stay as a daily driver. IMHO you'd want it coming onto boost as close as possible to the stock turbo

[Commsman]

+1, can't agree with you more Duncan.

My Hi-flow doesn't lend itself to picking gaps in traffic, or even driving briskly through a series of tight corners anymore. In day-to-day driving I really miss the response of my old setup.

[bigkevracer]

Didn't you get the little one Leon? That's supposed to be the less laggy of the two Hypergear options?

[Commsman]

Yeah, I did get the 'small one', lol. Turbo lag is very subjective though.

I might update my Hypergear review thread since I've had it a while now & have some more to report.

[sky^rkt]

mine is laggy but day to day driving its perfectly fine my wife drives it everyday she said it feels better

[scotty nm35]

Because its tuned mate, it makes a huge difference to response.

[WTBN]

Yeah as I may have eluded to in my first post its stock, and im very happy with it

Id like to keep it as close to that as possible, then again it's very tempting to go for more power when your repairing something of this value.. My thought process is 'well while it's out might as well make the most of the expense!'

Of course with that attitude, upgrading turbos comes more problems if you leave stock driveline etc. so after all - stock rocks. Esp given my recent haul of traffic infringements!

Anyone else had a similar situation - what was the result? high flow, upgrade, rebuild?

[Commsman]

I had a similar train of thought to you. Whilst the stock turbo (with other mods) suited me perfectly, I needed to fix the turbo & I couldn't bear the thought of replacing it with stock specs. To go to that much trouble you should get an upgrade, right?

Don't worry about the driveline. Except for a Transgo shift kit & tranny cooler which is highly recommended, the rest of the driveline will be more than adequate for the power levels of a hi-flow.

Edited June 6, 2012 by Commsman

[hypergear]

Yeah, I did get the 'small one', lol. Turbo lag is very subjective though.

I might update my Hypergear review thread since I've had it a while now & have some more to report.

No. You've got the bigger one. I'm currently building a small one at moment, I will post come comparison in wheel profile.

[scotty nm35]

Yeah as I may have eluded to in my first post its stock, and im very happy with it

Id like to keep it as close to that as possible, then again it's very tempting to go for more power when your repairing something of this value.. My thought process is 'well while it's out might as well make the most of the expense!'

Of course with that attitude, upgrading turbos comes more problems if you leave stock driveline etc. so after all - stock rocks. Esp given my recent haul of traffic infringements!

Anyone else had a similar situation - what was the result? high flow, upgrade, rebuild?

If you aren't going to tune it, definitely remain as close to the stock sized rear turbine wheel as you can. Our M35 doesn't react well to lag as it already feels very lethargic down low.

There are a few things you would need to do at a minimum if you went for the larger wheels imo, a 3 inch turbo back exhaust won't choke the turbo like the stock one, Emanage Ultimate with tune will bring it on much earlier, a Walbro/Deatschworks fuel pump hardwired, Brake cut mod and the shift kit installed in the gearbox. It's not a huge list but even then you will be injector and intake limited to around 220kw. There is no point getting a turbo capable of 260kw unless you plan to use it. (the stock turbo would be good for 200 or so if you were game)

I have had 5 different turbo's on my car now, the stock one definitely felt the best for everyday driving but the bug has bitten. lol.

[STAG250]

I hope the mechanics you use are cleaning out the banjo bolt or drilling it out larger, otherwise you could have another failure down the track. There is no way a legitimate 75k turbo will have failed if the oil supply hasn't blocked somehow.

Engine out? lol. Bugger that, unless you blow a head gasket.

What did yours end up costing in total STAG250? I have a feeling the mechanic's quote (2.5k) above was very low for an engine out job...

I posted a thread with pics back in 2007 but I can't find it on search. Over 3 grand kiwi with a bit extra thrown in. turned into a real saga with turbo needing to be sent back to recon man because of wrong measurements of this or that. Been ok since though. A bit laggy but no real experience of properly working stock to compare it to. Has the flutter on waste gate sound effect.

[Daleo]

Yeah, I did get the 'small one', lol. Turbo lag is very subjective though.

I might update my Hypergear review thread since I've had it a while now & have some more to report.

No. You've got the bigger one. I'm currently building a small one at moment, I will post come comparison in wheel profile.

Uh, Oh; waiting for Leon to see this...

Edited June 6, 2012 by Daleo

[Commsman]

No. You've got the bigger one. I'm currently building a small one at moment, I will post come comparison in wheel profile.

Uh, Oh; waiting for Leon to see this...

Cheers Dale, I just saw it . Well, that would explain the lag I'm experiencing.

Depending on future reviews, I'd have to say the smaller one could be the best choice for guys not wanting a 'drag car'. Sort of wish....

[ironpaw]

as above scott did mine hes in vic did a top job cant reccomend him enough! also i got the hypergear rebuild with fantastic results

Agreed, Scott replaced mine too...

[bigkevracer]

Cheers Dale, I just saw it . Well, that would explain the lag I'm experiencing.

Depending on future reviews, I'd have to say the smaller one could be the best choice for guys not wanting a 'drag car'. Sort of wish....

If it's really not what you want Leon, we may be able to organise a swap later Leon. Be happy to get mine rebuilt with the smaller core and get it shipped to you. Be interested to see the numbers the smaller core puts out, I'd be happy to compromise on top end power to an extent if I was going to get better response, just depends on how much of a compromise.

[ironpaw]

I have had 5 different turbo's on my car now, the stock one definitely felt the best for everyday driving but the bug has bitten. lol.

I think your old one (pre GTX) isn't too bad. I can't tell a huge difference between that and the stocker.

[Commsman]

If it's really not what you want Leon, we may be able to organise a swap later Leon. Be happy to get mine rebuilt with the smaller core and get it shipped to you. Be interested to see the numbers the smaller core puts out, I'd be happy to compromise on top end power to an extent if I was going to get better response, just depends on how much of a compromise.

Thanks for the thought Ryan. That may be on the cards later if my 'situation' remains static.

It's amusing (to me) how my mind works. Now that I know I have the bigger turbo, the amount of lag seems more acceptable to me somehow, lol.

Don't get me wrong, it still doesn't suit my driving style, or the type of roads I like to drive on, but I was more unimpressed when I thought I was using the 'responsive' hi-flow. Knowing what it is now sort of gives me an excuse for the lag.

Anyway, very keen to find out what the other one is like too,

[scotty nm35]

I agree Ironpaw, the stage one sierra comes on around 3k once tuned, that would be the laggiest I would go to remain drivable. Essentially you want GTRS/GT2835 sized wheels in the stock housings, no bigger unless you want a long list of supporting mods. If you work with Stao he can make whatever you desire at the end of the day.

[slippylotion]

Has anyone got actual sizes of the factory wheels?

[scotty nm35]

I have a stocker here I can measure but do you want the inducer/exducer sizes or just the hole diameters?