jevansio Posted July 23, 2008 Share Posted July 23, 2008 I've currently got my Supe at MS getting the manifold re-heatwrapped. They've got my turbo off so I took the opportunity to inspect the turbine blades. Although nowhere near as bad as mine & others fully damaged ones, the initial signs of a couple of the blade edges being nibbled are definately there. I have never run 2 Step on this one & my EGT's have never been over 950 (and I now measure temps pre turbo). I didn't get a chance to take any pictures but I'm pleased I've taken the decision to leave this turbo. Quote Link to comment Share on other sites More sharing options...
AndyT Posted July 23, 2008 Share Posted July 23, 2008 Do seem a tad weak don't they? I personally wouldn't risk fitting one. Too many good units out there. Quote Link to comment Share on other sites More sharing options...
Marty Posted July 23, 2008 Share Posted July 23, 2008 Sorry to hear about another one Jay Still, its not just common to the 4088's... here's a recent picture of my t67, not looking too healthy. This turbo has only seen 1.1bar and very little Wot on my car, maybe 5000miles, 98% being off boost motorway miles. I've not noticed any difference in performance, so i'm not in any rush to change it. Quote Link to comment Share on other sites More sharing options...
jevansio Posted July 23, 2008 Author Share Posted July 23, 2008 Do seem a tad weak don't they? I personally wouldn't risk fitting one. Too many good units out there. Yeay, I wouldn't get another Sorry to hear about another one Jay Still, its not just common to the 4088's... here's a recent picture of my t67, not looking too healthy. This turbo has only seen 1.1bar and very little Wot on my car, maybe 5000miles, 98% being off boost motorway miles. I've not noticed any difference in performance, so i'm not in any rush to change it. Wow Mart, that looks pretty well ****ed too I would never have known my 1st one had gone either just by the lack of performance Quote Link to comment Share on other sites More sharing options...
bolarbag Posted July 23, 2008 Share Posted July 23, 2008 Is that a Garret T67? How do they end up like that after so few miles when oem turbos last 100k miles and don't look half as bad? Quote Link to comment Share on other sites More sharing options...
Wez Posted July 23, 2008 Share Posted July 23, 2008 Not good Looks like they are not able to handle the heat. Quote Link to comment Share on other sites More sharing options...
steve spedd Posted July 23, 2008 Share Posted July 23, 2008 Do seem a tad weak don't they? I personally wouldn't risk fitting one. Too many good units out there. What is the best all round turbo then? i really liked the idea of having one of these one day. Say a Turbo that is set up for 500hp that spools up fast, very little lag etc? for a road car with the odd track day. No drag strips..... thanks Quote Link to comment Share on other sites More sharing options...
JustGav Posted July 23, 2008 Share Posted July 23, 2008 Hasn't it be determined that the 4088 is a truck turbo (originally)... Being diesel, they run MUCH lower EGTs. I'd hazard a guess they are just heat burning the edges and it just goes from there.... Quote Link to comment Share on other sites More sharing options...
jevansio Posted July 23, 2008 Author Share Posted July 23, 2008 This is a GT4088R though Quote Link to comment Share on other sites More sharing options...
uk-rich Posted July 23, 2008 Share Posted July 23, 2008 i thought the "r" just meant water cooled Quote Link to comment Share on other sites More sharing options...
jevansio Posted July 23, 2008 Author Share Posted July 23, 2008 i thought the "r" just meant water cooled And dual ball bearing Quote Link to comment Share on other sites More sharing options...
JustGav Posted July 23, 2008 Share Posted July 23, 2008 Water cooling and ball bearing wouldn't stop heat on the edge of the turbine blades. Quote Link to comment Share on other sites More sharing options...
jevansio Posted July 23, 2008 Author Share Posted July 23, 2008 Water cooling and ball bearing wouldn't stop heat on the edge of the turbine blades. Yeah I know , but it's in Garretts latest GT roller bearing lineup along with the well praised GT35R, GT42R etc, but we don't hear about those failing, I doubt Garrett would use a different design/material on a turbo in the middle of it's lineup, or maybe they would , either way I migt just turn the anti-lag on this one for 6 months now & have some fun Quote Link to comment Share on other sites More sharing options...
Wez Posted July 23, 2008 Share Posted July 23, 2008 Has anyone actually contacted Garrett with pics of turbos that have failed in the same way on different cars? Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted July 23, 2008 Share Posted July 23, 2008 I spoke to Turbo Technics, or maybe it was Turbo Dynamics about this an the response was that the only difference between the petrol and the diesel version was the exhaust turbine housing, the rest is all the same, and it was thought that the only possibility for this damage was down to the housing distorting and touching the blades, doesn't sound right to me as the damage look to irregular. Quote Link to comment Share on other sites More sharing options...
AlanM Posted July 23, 2008 Share Posted July 23, 2008 I still think it is a cavitation effect. Will have to brush up on this but it was common on lower revving turbines operating in denser mediums. I will have to exercise the brain a bit and do some research before saying anymore Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted July 23, 2008 Share Posted July 23, 2008 If this is down to cavitation effect , then how come it only effects these turbos, if the material for the exhaust turbines are all the same for all the Garrett range? Quote Link to comment Share on other sites More sharing options...
AlanM Posted July 23, 2008 Share Posted July 23, 2008 Simple answer to that is that I don't know. But whatever effect it is, cavitation or other, that is causing this, it is only happening on this turbo. Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted July 23, 2008 Share Posted July 23, 2008 (edited) You know what Marty's pic looks like to me? Turbine creep. This used to happen on gas turbine engines when the turbine material overtemps, stretches and rubs on the turbine casing. If you look at the pic you can see hot spots on each blade and only in that area the edges have been torn off. I reckon thats a valid theory... Edited July 23, 2008 by Swampy442 (see edit history) Quote Link to comment Share on other sites More sharing options...
AlanM Posted July 23, 2008 Share Posted July 23, 2008 Wouldn't you expect creep to be more uniform though? Quote Link to comment Share on other sites More sharing options...
bolarbag Posted July 23, 2008 Share Posted July 23, 2008 They all seem to be the DBB type dont they? The bearings could be giving way at the 130K rpm or whatever they spin at, and under the intense heat - any effect of expansion on the turbine blades due to the heat would take them closer to the turbine housing The fact that its not uniform would enhance this theory as bearings giving way would create a spontaneous movement of the shaft, the compressor would be in a better condition as both the comp housing and compressor blades are under less heat Does anyone run water injection and their turbos suffer the same fate? Maybe its just too much timing retard for the material Quote Link to comment Share on other sites More sharing options...
AlanM Posted July 23, 2008 Share Posted July 23, 2008 Nobody has had any evidence of bearing failure though? Having difficulty thinking about htis, 20 years since I was doing any of this. Quote Link to comment Share on other sites More sharing options...
b_have Posted July 23, 2008 Share Posted July 23, 2008 Any evidence on the inside of the housing of the blade touching? My turbine still looks like new although I use meth injection. Quote Link to comment Share on other sites More sharing options...
Wez Posted July 23, 2008 Share Posted July 23, 2008 Any evidence on the inside of the housing of the blade touching? My turbine still looks like new although I use meth injection. And this car sees track action Quote Link to comment Share on other sites More sharing options...
jevansio Posted July 23, 2008 Author Share Posted July 23, 2008 I run water injection also Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.