I have done a lot of searches on safe levels w/ the stock ecu (as some people are adament about staying at 10psi w/ a stock ecu - and I would rather stay on the safe side), but haven't really seen anything mentioned about overboosting with a stock car.

I have a 1993 automatic with 26K original miles on it, and have the bar boost gauge. It would read between .70 and .90 (or roughly 10 to 13psi). Remind you, this was when my car was completely stock. I don't believe it stayed above 10psi, but am not 100% sure since it wasn't in psi.

Just a few days ago, I added a defi psi boost gauge, dp, rb dual tip cat, and an upgraded fuel pump. I'm still getting approximately the same readings, and from what I've noticed, my boost will get up to 12.5psi or so (and noticed it did get up to 13.8 once). I think I'm getting a boost pattern of 12.5-8-12.5 normally. Also, it will then stabalize at 10psi after the initial boost pattern.

Anyways, the more I read about safe levels of the stock ecu, the more I feel like an aftermarket ecu or boost controller is the way to go. However, since I'm really not getting anymore boost then when the car was completely stock (and don't plan on adding any more modifications other then maybe reliability mods), I just wanted to see what everyone here thought.

Has anyone had this problem w/ a stock car? The last thing I want is for my engine to blow, and was wondering if there could be other reasons why I'm overboosting since I am getting approximately the same readings as when the car was stock.

Also, have searched, but haven't really found the difference between boost creep and boost spike. Thus, not really sure what I'm explaining.

Thanks for your time.
Terry

 

bump.... anyone?

 

your boost levels are too dangerous for the situation and mods you are describing. I'd seriously consider a boost controller or ECU.

.....or else you could be buying a new engine soon instead.

 

Just purchase a boost controller:

http://www.rx7store.net/product.asp?0=208&1=243&3=770

It's probably still cool in Chicago at the moment, so that is also contributing to your above normal boost.

 

When I lived in Missouri and had a stock car I used to get boost spikes in winter.

Check your intake hoses for holes and get a boost controller.

 

get a boost controller........ soon!!

 

I can get up to about 12 psi spikes on my car as well, but it somewhat appears to be dependent on the weather. It's a 95, 60k miles, only a catback exhaust and drop in K&N. I saw the same things before the catback as well. I'm not really sure what/if anything to do about it. My other car acts similarly, spiking in different weather differently. Summer it stays around 15 like it should, winter it'll see 20-21.

Someone correct me if I am wrong on this one, but spike is basically when your turbo spools up, the wastegate isn't quick enough opening to dump excess ehaust gas so you will momentarily see higher than desired pressure. Creep occurs when you just have too much exhaust gas flow for the wastegate to handle so it will go through the turbos instead and your pressure will increase.

 

You are all telling him to get boost control. What do u recomend. I have heard great things about the APEXi AVC-R boost control. Anyothers?

 

Get a profec B series 1. Its the only one to mess with.

 

 

profec-b is nice. simple, cheaper than others and does a great job. has 2 settings

 

thanks for the help guys. so it sounds like the profec b is definitely the way to go. however, i noticed that most recommended the series 1 instead of the spec 2. is there any reason?

also, is there a reason why you don't recommend an upgraded ecu (besides cost of course)?

thanks for all the help.

terry

 

fuzzy does not jive with seq. set-ups well also the b is cheaer and does what you need!