R33 Turbo Issues

[RB_purr]

Hey guys just hoping someone could enlighten me on some troubles with my 33 turbo etc.

I have searched numerous times for answers to the problem but still no luck :|

R33 GTS-T series 2 96

The mods are as follows

Splitfire coilpacks

FMIC

Full 3 inch exhaust with split dump and high flow cat

Apexi pod filter

Stock turbo setup nothing changed at all

Okay so down to the actual problem.

So generally boost kicks in at about 2500-2700rpm on the stock turbo anyway since having the exhaust done as soon as I left the workshop hey presto turbo kicks in at 5500rpm which is ridiculous ! Sure enough the exhaust sounded great but I guess I was in for a tune.

Luckily I had an Apexi power fc already on the way but I can't understand why the turbo kicks in so late when I only had a split dump installed and resonator removed.

Now here's the weird thing.

About 3 weeks later I was boosting it hard on a hill run and after a good flogging the turbo somehow began to work normal again and started spooling at 2500-2700rpm and had been fine ever since except the exhaust is now a lot quieter than it was when I left the shop

I'm just wondering why is it that it somehow went from being ridiculously late and then back to normal again? Wastegate stuck open? And why is the exhaust now seemingly quieter I don't know so send help guys!! Haha

Many thanks in advance

Curtis

[GTSBoy]

Wastegate stuck open most likely cause. Cheap split dumps often cause that problem unless carefully checked and perhaps clearanced.

[KerrodR33]

+1 to wastegate stuck open on split dump.

Buy a Just Jap bellmouth dump pipe and enjoy.

[Ben C34]

As said, definitely the split dump had made the waste gate get stuck open.

[RB_purr]

thanks for the heads up guys wastegate was definitely sticking....

it got stuck once today on the dyno run

So what do you all think?

Revert back to a straight downpipe
Get a dowpipe with a longer intergrated dump?
Bellmouth style dump pipe like Darth Kerjo said

Cheers guys

[jjman]

if the guy at the shop is any good then get him to evaluate whether is can be modified to not hit and stick on the dumb (bit of grinding etc).

Otherwise just get a big bell mouth dump that's tried and tested on skylines.