Wastegate spike from Hell
 

Well, I've been boosting 4-5psi lately (also wasn't getting full boost till around 4500) and I just had to do something about that. So I drilled another hole in the wastegate arm so It would effectivly shorten it. Took it out for a drive and hit 10psi and it blows a charge pipe. Fix it then try it again and I hit 10psi quickly at around 3000 rpm's and it even breaks the tires loose. ;D And then the boost settles down at 5psi ???, wtf?
I've heard of boost spikes but damn, a 5psi drop. that sucks.
So I guess my question is how do I fix it?
T-25 internal gate.

Could this be cause I have no gaskets between the turbo and adapter plate and mani?

Thanks ahead.

Re:Wastegate spike from Hell
 

no gaskets = exhaust leak = turbo lag = you mess with wastegate = major boost spike = get gaskets! lol

Re:Wastegate spike from Hell
 

koo, anyone know a good place to get these gaskets for cheap online. Went to autozone and they don't know what a turbo to manifold gasket is, went to advanced and they're conviced that the hf has normal headers like the si. Sheesh

Re:Wastegate spike from Hell
 

just get the normal honda header gasket for your car and then go to mitsubishi and get the turbo to manifold gasket (if its the DSM)... might even want to spray some of those copper headgasket spray on the gasket to make a better seal. Hope this helps.

Re:Wastegate spike from Hell
 

What car did your T25 come off of? Off subject, i know.
2g dsm?

Re:Wastegate spike from Hell
 

If its the T25 then its off the 2g DSM... But I dont know which one 90zcrx has though thats why I specified if its a DSM one.

Re:Wastegate spike from Hell
 

Actually I have a T25 off of a factory turbo car, a non dsm car. Not even an import... a GM ;). T25 from an 89 Turbo Grand Prix 3.1L

I wish i knew more about it, has a .80 a/r what is the 2g dsm a/r??

Re:Wastegate spike from Hell
 

yeah its the mitsu t-25. Hopefully this cures the spiking, then I gotta fix the overheating, and now my clutch is slipping, fun, fun, fun. ::)

Re:Wastegate spike from Hell
 

I dont remember exactly but in a previous thread someone said around the .40's

Re:Wastegate spike from Hell
 

I just use the high temp red gasket maker...