camaro383

iTrader: (13)

I have a 370ci motor with ported 317 heads and a pt88 on truck manifolds, i put the jgs 50mm wastgate on and without a boost controller, im only seeing a max of 4psi boost, not sure of the spring rating in there but even if it was a 4# spring, i didnt think this wastegate would be big enough to even get me that low of boost, which leads me to suspect that there is another issue

And does anyone know the ratings of the jgs springs

transammiller

iTrader: (21)

do you have a boost reference to the bottom port? if so that is completely normal. my TC76 with a JGS 50mm only gets about 4 psi on the spring with the bottom port referenced. you can T off the reference to the top and bottom ports. that will slightly more than double your boost. i get about 11lbs with both ports referenced. if you take the reference off completely and run just back pressure it will do a just a bit less than double. now these are just estimates and basic rules. that's not factoring the many variables such as Turbine backpressure, wastegate efficiency, pipe routing/length and recirc backpressure from the downpipe.

camaro383

iTrader: (13)

ahh i see, ya i was not impressed with the cars performance on 4#s of boost lol, ill put a manual boost controller in to see wut i coul do, i hope its gonna make atleast 650rwhp at 10#s especially with the t56, but it feels like at 4#s it cant be more than 420rwhp (only have the timing set at 11* for now)

bad6as

iTrader: (17)

same thing with mine. boost to lower port 4 lbs.
nothing going to wastegate like 7lbs.

98Z28CobraKiller

iTrader: (17)

They are that good! Don't go rigging **** up to the top port. Either put a controller on it or just go to the next heavier spring. It should have come with a couple. And I agree, even the 6-7 psi that I make with the controller off makes me think that something is wrong with the car. SLOW!

bad6as

iTrader: (17)

i cant wait to hook up my ams500 and alkycontrol kit. this 4-8 lbs boost ***** for the birds

camaro383

iTrader: (13)

lol, i slapped on my brothers manual boost controller and made some passes and it maxes out at 9psi now, wow is all i could say lol, huge difference and i was only pulling 13 degrees, gonna bump it up to 15 since my compression is about 10:1, i was looking at the eboost2 I like that it has an aux output
how does the ams500 compare to this unit, does it have aux outputs as well

i cant wait to get to 15psi of boost i can tell already im hooked, this is way better than nitrous

CarsandWomen

iTrader: (19)

^^^ just a heads up, i got this info strait from JGS, i have the same gate. the sring in it from the factory is 7 psi, but they told me to expect to see about 4.5 psi with it. So no, nothings wrong.

camaro383

iTrader: (13)

Ya im gonna try to get a stiffer spring, but i was surprised i was making 9psi at 3600rpm

CarsandWomen

iTrader: (19)

^^^wow if youve got a Tbrake and a 2step with a 3600 stall that would be a helluva launch lol

98Z28CobraKiller

iTrader: (17)

The AMS500 will control boost better but lacks the bling appeal and bells and whistles of the eBoost2.


Leave the spring alone. Buy the AMS500 with a 10oz CO2 kit and be able to control boost from 4.5-45 psi without getting dirty.

Gonoma

iTrader: (15)

Does it have to be a CO2 kit? If not does the air supply only have to be equal or greater than 45 psi?

Dragframe

iTrader: (14)

Depends on a lot of things... you have to play with it


The ams500 does c02?? Damn im gunna have to find someone to buy this eBoost2. I figured the ams1000 was the only one to have the co2 option

EDIT: Nevermind I seen you can use c02... Now my question for you. I seen your post on yellowbullet. Seemed after everyone told you AMS1000 you still went with the 500. What sold ya on it and how ya like it??

98Z28CobraKiller

iTrader: (17)

I don't really like paying for features I don't need. My suspension works pretty well so at this power level (and down to 8.5 or so), the more complicated ramps and multiple stages are not required. While on LS2Formula's car, the AMS1000 is necessary.

camaro383

iTrader: (13)

So i guess the ams500 may be where i need to be at
I made a pass with my buddies 720rwhp t-trim vette and he was only about a car out on me, so i guess im making decent power, but then i decided to try a 5th gear pull and i believe my spec 3+ is slipping now cause i doubt i was spinning the tires in 5th

Btw im still at 9psi and upped the timing to 16* and left the afr alittle on the fat side

Man im lovin this thing lol

Also wut kinda timing are u running 98z28cobrakiller, im wondering if i could go alittle higher than 16* safely with my 9.8:1 compression and 9psi

98Z28CobraKiller

iTrader: (17)

You'd have to get on a dyno and/or read plugs to determine where you should be. Cam, heads and charge temps all play a factor in how much timing you can give before experiencing detonation.

I run 16* @ 12-13 psi on the street on pump gas. My compression is about the same as yours.

camaro383

iTrader: (13)

I was thinkin about gettin an exhaust gas temp gauge, i was told that you could tune for timing based off of the egt

98Z28CobraKiller

iTrader: (17)

EGT tuning is a bit of an art mixed with a little voodoo. Fuel and spark both effect EGT but reading plugs is how the pros do it. I have a general understanding of how to read the important stuff on a plug. What I don't really understand is how to tell if your heat range isn't optimum. EGTs are great for individual cylinder tuning though. By seeing their exhaust temps compared to each other, you can see a problem cylinder immediately. The sensors are small and robust from what I have been told as compared to WBO2 sensors which are bigger and more delicate. The controllers are cheaper as well. That said, I've never seen a street car with individual EGTs (not counting diesel trucks here) and I've seen a shitload of really fast street cars.

camaro383

iTrader: (13)

ya i hear ya man, so i guess ill make a 4th gear pull and then shut down the engine once i hit my max rpm and pull #7 plug and replace, and then read it at home, I guess ill google a good writeup on sparkplug reading lol.....

I appreciate all the help man... i know you said that the ams500 was your weapon of choice, but how do u feel about the eboost 2.....I like it better than the ams cause it has a boost gauge( which i still need) and the aux outputs are a big plus, so that i can use it to turn on my second fuel pump when i install it and if i decide to go with meth it can trigger that as well...

however i like the idea of the c02 cause of the precision you have with boost control, but is it really all that necessary, cause the c02 sounds like another extra system to worry about and over complicate things...

if you dont mind giving me your opinion on my questions of the 2 boost controllers

thanks

98Z28CobraKiller

iTrader: (17)

I personally have no experience with the eBoost2 but a couple of the local guys run it and like it. I think there was another thread floating around just the other day comparing the eboost to the ams. Fish around for it.

As for the CO2, it's not neccesary but it is also not at all complicated as it is completely mechanical. The electrical side is all for the boost controller and you will be running the solenoids regardless (unless you go MBC). I will tell you that I would bet the last dollar in my pocket that if you had a controller that will work either way and you try the the co2, you wont give it back.