mattduke

ok so i have a 94 integra ls b18 with a t3 turbo
p28 ecu tuned on chrome...i have no exhaust
just down pipe...on that note my car it spiking
it was on 10ld going up to 15ld so i turned it down
to 8ld and it spiking to 12lb or 13lb. how can i fix it
is it cause i have no exhaust? not enough back pressure?

sixcyl?

From what I understand...Even turbos need back pressure. But I don't think that's the root of you problem. When was it tuned and how? Also, check for any leaks (a long shot but always my first step with boost problems)

TurboQuad4

Is it spiking on initial boost and then coming down, or creeping towards the top end? Try just hooking your boost controller inline with the bottom wastegate port and taking the top one off. Is that a knock-off Tial wastegate (looks like one) or a real Tial? What psi spring is in it? If it's a knock-off, it might be sticking or diaphragm could be torn due to poor manufacturing.
Also, has it always done this since you've had the turbo on? It could be poor wastegate placement on the manifold as well.

mattduke

iv only had the car for a month got it as is the guy told me it was tuned 3 months ago
how much is a tune? and where could i go i live in va beach idk any shops that work on
turbo hondas...and i think it is a knock off should i just get a new wastgate and how would i know
if it not placed right

92civic

Replace that wastegate with a hypergate and u will have no more problems , and a good tune. There's ur answer. By the way never go cheap on manifold wastegate and turbo

TRQLESS

As stated before it's probably the wastegate and the turbo manifold is an ebay special. I've seen these kits do fine before, so it's probably the wastegate.