1.51 Bar / 22 PSI
08 February 2022, 10:20 PM
#1
Scooby Regular
Thread Starter
1.51 Bar / 22 PSI
Hi all,
My forged 2007 STi has the standard turbo on it. It's Bob Rawle mapped, and the turbo has done 100k miles.
My PSi 3 has just read 1.51 bar max boost. Is that pretty healthy? Should I be on nearer 1.8 bar?
My forged 2007 STi has the standard turbo on it. It's Bob Rawle mapped, and the turbo has done 100k miles.
My PSi 3 has just read 1.51 bar max boost. Is that pretty healthy? Should I be on nearer 1.8 bar?
08 February 2022, 11:36 PM
#2
Scooby Regular
probably more helpful , how much bhp have you ? so is turbo maxd out and is engine in the correct bhp for what’s been done to it mods wise ? , for me even forged i would be max 400 bhp on an engine as i want reliability too , but even 400 bhp can kill them 👍
09 February 2022, 11:21 AM
#4
Scooby Regular
If it's the standard turbo it sounds correct to me. I think you'll only have a 3bar map sensor so if you're still on a standard sensor then you shouldn't run over 1.6 bar anyway.
09 February 2022, 06:09 PM
#5
Scooby Regular
Thread Starter
Yes standard 2 port BCS, and 342bhp with 410ft lb's
I never had it remapped after it's second build, there's a lot of lag low down which isn't right for a mapped 2.5
My previous build was not laggy at all.
Hopefully map check / tweak later this month. Recent MAF as old one was giving poor readings, but been laggy a while now, long before the new MAF.
Standard airbox / filter / injectors etc.
I never had it remapped after it's second build, there's a lot of lag low down which isn't right for a mapped 2.5
My previous build was not laggy at all.
Hopefully map check / tweak later this month. Recent MAF as old one was giving poor readings, but been laggy a while now, long before the new MAF.
Standard airbox / filter / injectors etc.
09 February 2022, 06:44 PM
#6
Scooby Regular
I’d definitely have the map checked. If it’s still laggy then maybe get it smoke tested in case you have a small boost leak. Also definitely worth changing maf as they do fail.
does it have tgv’s?
does it have tgv’s?
10 February 2022, 05:20 AM
#7
Scooby Regular
Thread Starter
MAF was changed with a brand new genuine one just a few weeks ago. Yes, TGV's still in the inlet manifold I think. I don't hear any escaping air for a boost leak though, but I should get it tested. Fingers crossed it just needs a map tweak.
Trending Topics
10 February 2022, 07:45 AM
#8
Scooby Regular
I’ve had sticky tgv’s before which obviously causes a restriction. Your mapper will be able to check that though.
it sounds like it just needs a proper map. Every time I do anything to mine I have it mapped.
it sounds like it just needs a proper map. Every time I do anything to mine I have it mapped.
10 February 2022, 07:47 AM
#9
Scooby Regular
Reading the comments it sounds like you had a rebuild but didn’t get it mapped afterwards. If that’s the case then I’d get it done asap
10 February 2022, 06:36 PM
#10
Scooby Regular
Thread Starter
Correct, 15k miles ago it was rebuilt but never mapped.
My old build was mapped, so running on same map as no other changes to anything else like injectors, airbox, exhaust etc.
My old build was mapped, so running on same map as no other changes to anything else like injectors, airbox, exhaust etc.
Last edited by Hawkeye D; 10 February 2022 at 06:37 PM.
11 February 2022, 08:42 AM
#14
Scooby Regular
I can’t remember which cars have the TGV’s, I know the blob STi doesn’t but I’ve never had a hawk.
id always advise mapping after an engine is rebuilt, especially if it’s had to go up a piston size or different components used. Hopefully that will either fix the issue or highlight what’s going on.
another thing I had was a cracked up pipe. The blow was quite subtle but that made it laggy. Could check your headers and up pipe.
good luck with it and report back when you’ve resolved it
id always advise mapping after an engine is rebuilt, especially if it’s had to go up a piston size or different components used. Hopefully that will either fix the issue or highlight what’s going on.
another thing I had was a cracked up pipe. The blow was quite subtle but that made it laggy. Could check your headers and up pipe.
good luck with it and report back when you’ve resolved it
11 February 2022, 08:44 AM
#15
Scooby Regular
when the UK/EU cars went 2.5 for MY06 then ALL cars reverted to TGV use with the addition of the air-pump system and the WRX losing the pre-catted up-pipe.........
The following users liked this post:
11 February 2022, 10:53 AM
#16
Scooby Regular
Thread Starter
I can’t remember which cars have the TGV’s, I know the blob STi doesn’t but I’ve never had a hawk.
id always advise mapping after an engine is rebuilt, especially if it’s had to go up a piston size or different components used. Hopefully that will either fix the issue or highlight what’s going on.
another thing I had was a cracked up pipe. The blow was quite subtle but that made it laggy. Could check your headers and up pipe.
good luck with it and report back when you’ve resolved it
id always advise mapping after an engine is rebuilt, especially if it’s had to go up a piston size or different components used. Hopefully that will either fix the issue or highlight what’s going on.
another thing I had was a cracked up pipe. The blow was quite subtle but that made it laggy. Could check your headers and up pipe.
good luck with it and report back when you’ve resolved it
Yes I did have to go down one size on the Mahle pistons.
Reason being, my first build I had the block honed so needed the larger Mahle pistons. The car was then mapped accordingly.
4 years later that block cracked at the top of one of the cylinders.
During this first build, the secondary air pump was deleted, and throttle body coolant delete was done too.
So most recent build was a brand new block so in that build had to go back down a a size to fit the standard size Mahle's. Car never mapped / tweaked afterwards. I do sincerely hope that no damage has been done over the last 15k miles as a result of not having the map checked / tweaked.
Last edited by Hawkeye D; 11 February 2022 at 10:56 AM.
11 February 2022, 11:29 AM
#17
Scooby Regular
I hope for your sake there is no damage. Who rebuilt the engine out of interest? did they not recommend a map tweak? I don't really know enough about mapping to say if it needed a tweak or not, I just always get it done just in case.
11 February 2022, 12:58 PM
#18
Whole exhaust system is ok, no blows or leaks.
Yes I did have to go down one size on the Mahle pistons.
Reason being, my first build I had the block honed so needed the larger Mahle pistons. The car was then mapped accordingly.
4 years later that block cracked at the top of one of the cylinders.
During this first build, the secondary air pump was deleted, and throttle body coolant delete was done too.
So most recent build was a brand new block so in that build had to go back down a a size to fit the standard size Mahle's. Car never mapped / tweaked afterwards. I do sincerely hope that no damage has been done over the last 15k miles as a result of not having the map checked / tweaked.
Yes I did have to go down one size on the Mahle pistons.
Reason being, my first build I had the block honed so needed the larger Mahle pistons. The car was then mapped accordingly.
4 years later that block cracked at the top of one of the cylinders.
During this first build, the secondary air pump was deleted, and throttle body coolant delete was done too.
So most recent build was a brand new block so in that build had to go back down a a size to fit the standard size Mahle's. Car never mapped / tweaked afterwards. I do sincerely hope that no damage has been done over the last 15k miles as a result of not having the map checked / tweaked.
11 February 2022, 06:11 PM
#19
Scooby Regular
Thread Starter
11 February 2022, 07:35 PM
#21
Scooby Regular
Thread Starter
Thread
Thread Starter
Forum
Replies
Last Post