Split Dump Verse Bell Mouth

[dmonic1]

hi all i have an S2 auto which was dead stock when i brought it and i INTENDED on it stayig that way. lol

for ages i was driving it around with a split dump pipe and trust PE2 exhaust, trust airinx filter and some split fires. everything was running really nice and i had never come across a problem the car felt fairly quick and i had it running about 10 psi.

next step i upgraded the turbo to a high flo GT3071. first problem i had was that because the exhaust wheel was so much bigger in the new turbo i had to cut off the internal pipe that fitted into the original turbo to keep the gasses away form the waste gate which is the reason behind a split dump. this caused alot of lag and made me think if the new turbo was really worth the cost.

well the other day i fitted a bell mouth dump pipe and holly hell what i difference. i now have boost much earlier and alot more top end pull.

as i have a RWD i also have traction control and now when i pull off the line and hold it flat the car starts to fight the traction control as she comes onto boost and my traction control warning light comes on on the dash. with traction control off it actually very nearly turnes the tyres as she comes onto boost, only first gear but pretty good improvement if u ask me.

sorry for my rambling but i just thought i would tell everybody what i have found after trying both types of dump pipes. i think if ur planning to keep the mods to a minimal the split dump is great but if ur going to get a bigger turbo down the track either wait til u do and get a custom split dump made or just get a bell mouth to start off with.

upgrades so far are in order of purchase, air filter, exhaust, split dump, split fires, 10psi, fmic, GT3071, coilovers and sway bars, MV automatics shift kit (please get one if u have an auto u wont regret it) and last the bell mouth. next is Z32 fuel pressure reg with the nistune ecu board

[wolverine]

same experience, the bellmouth made more power everywhere than a name brand split dump.

[webng]

Which bellmouth did you get? The JJR one?

[dmonic1]

yeah thats the one. pretty good price to when it comes a couple of hundred bucks less than the split dump i brought

[BigDirtyJase]

+1 for bellmouth

I've got one on my Stagea, but it had to be slightly modified for my car. Apparently Just Jap sent me the wrong one - didn't know until it was being installed