what is a SPIKE?

[WabTheKing]

mate said my car was doing it last night??

something to do with the boost pulsing?

and something bout its not good,

regards
will

[Dave cook]

http://www.allpar.com/mopar/boost-creep.html

try this

[WabTheKing]

Boost creep is rising boost due to not enough exhaust bypassing the housing. For example, you're set for 13 psi, and when you floor it, you get a quick rise to 13 or 14 psi. But then as rpm's climb, the boost creeps higher and higher: 14, 15, 16, 17, etc. Enlargening the wastegate hole is one cure for boost creep, as you did.

Spiking is when your wastegate hole is large enough, but your actuator can is taking too long to fill with compressed air, so you *temporarily* overshoot your boost level. Example: you're set for 13 psi, and when you floor it it quickly rises to 16 psi, but then gradually drops downward towards 13 psi again.

A common problem with modded engines is a combination of spiking AND boost creep. That's where you're set for 13 psi, and when you floor if it overshoots to 16 psi, *begins* to drop back down, but as the rpm's rise it goes up again!

Normal boost rise when set to 13 psi = shoots up to 14, then 13, 13, 13...
Spiking = shoots up to 16, then 15, 14, 13, 13, 13...
Boost creep = shoots up to 14, then 13, 13, 14, 15, 16, 17...
Spiking and boost creep = shoots up to 16, then 15, 14, 13, 14, 15, 16,17...
Set a manual boost control to 11 psi and floor it slowly in high gear. It should go to 11 psi and hold it pretty well. If it starts to slowly climb over 11 psi as the rpm's get high, that's "creeping". The boost creeps higher at high rpm's because there's too much exhaust flow for the wastegate hole to bypass.

Now go to 11 psi again, but tromp on it quickly! It will shoot to 13, or 14, or 15 psi, then drop down to 11 and stay there. That's "spiking".

Spiking is a quick flash of high boost that goes a little beyond your set boost point. If you are set for 11 psi, and you tromp on it quickly, this might happen: boost "spikes" to 14, quickly drops to 11, then slowly "creeps" back to 14 or more as the rpm's climb. Now you are seeing spiking followed by creeping!

[WabTheKing]

i didnt write that by the way i copied/pasted it

[Ski]

How are you planning to solve this issue?

Im not happy with my performance and suspect i have similar issue.

[WabTheKing]

duno-
was hoping someone would of posted a solution by now

[Fat Audi 80]

For a minute there I thought you had gone schitzofrenic (sp) on us and answered your own question!

[WabTheKing]

yes my ulter ego knew the answer

[Mihnea]

Guys, IMHO the problem you are both experiencing is due to poorly remapped chips, especially Wab who's running that famous Ebay-digitec chip.


HTH,

Mihnea

[Ski]

well that sux!

[Mihnea]

@Ski: quoting your signature: cheap is not good and good is not cheap. It's particularly true for Wab, as I have no idea what/whose chips you are running.

Mihnea

[WabTheKing]

both didgi tech from qrsport

[Mihnea]

No offense intended to Tim and QRSport but digitec chips for 3B are the last chips you want to buy if you like your engine. That's all I'll ever say about them, more has been said about this earlier on, no knock sensor function, mapping done for bigger than stock injectors, mapped for a 250kPa but people use the stock 200 kPa, and so on.

Mihnea

[WabTheKing]

mates got another ecu (standard we think) to try in it to see it still surges will post results

[Ski]

Please keep us informed Wab-Da-King.