420A compression ratios and boost.

[1g8420a]

I have recently bought a 97 gs and, I am in the middle of the rebuild. I am doing a mild build. The Cyl. head has Manley springs and ti retainers I am going to order cams and gears ect ect.

I have Decided to go with JE 10:5:1 Pistons with eagle rods. My question is, is it safe to boost on about 7-8 psi if not why? I have found that the 420A pretty much makes minimul power gains N/A. (I have posted a build journal of my progress with photo's titled 420A from the ground up) I am new to DSM and appreciate any advice to help me get the most out of my 420A Thanks guys.

 

[Shake_Zulla]

I have recently bought a 97 gs and, I am in the middle of the rebuild. I am doing a mild build. The Cyl. head has Manley springs and ti retainers I am going to order cams and gears ect ect.

I have Decided to go with JE 10:5:1 Pistons with eagle rods. My question is, is it safe to boost on about 7-8 psi if not why? I have found that the 420A pretty much makes minimul power gains N/A. (I have posted a build journal of my progress with photo's titled 420A from the ground up) I am new to DSM and appreciate any advice to help me get the most out of my 420A Thanks guys.

7-8psi would be acceptable for non-forged pistons as well as forged. There are a few fuel upgrades you will have to do however. Here is the walkthrough...
http://www.dsmtuners.com/forums/420a-turbo-conversion/366603-end-all-parts-list-go-turbo.html

 

[Slo2gen]

Yes but if he is in the middle of a build I say go for it. I loved my 10.5:1 turbo motor. As far as cams I would go with something like the Crower 2's or Crane 16's ( PM me if you want a set of gently/barely used 16's as I have a set) but so far your on the right path. I would also recommend you looking into either Portfueler or MS for your EMS so you can take advantage of your motor and run some decent boost on it. My last motor I ran up to 18psi on so as long as you have a solid motor and good control over your ignition/fuel you should be good to go!

 

[1g8420a]

Yes but if he is in the middle of a build I say go for it. I loved my 10.5:1 turbo motor. As far as cams I would go with something like the Crower 2's or Crane 16's ( PM me if you want a set of gently/barely used 16's as I have a set) but so far your on the right path. I would also recommend you looking into either Portfueler or MS for your EMS so you can take advantage of your motor and run some decent boost on it. My last motor I ran up to 18psi on so as long as you have a solid motor and good control over your ignition/fuel you should be good to go!

Yeah, I am working the kinks out and, don't want to blindly waste my money on parts or stuff that will not work, for the build I want. Is it possible to get 10:5:1 pistons at a cheaper price? should my pistons be forged? and where could I find Pistons that are not forged at 10:5 comp.?

 

[compression]

yes forged, but i believe most of the aftermarket pistons you will encounter are forged, including the JE if i am not mistaken.

 

[necrotopsy]

JE pistions are forged.

If you have it tuned properly and have the supporting fuel mods, then yes it should be fine

keep in mind, once the boost bug hits you, you're going to just want MORE BOOST!
with high CP that's going to be harder to do then with low CP.

 

[Slo2gen]

JE Pistons 95-05 Neon

If your boosting and raising compression IF you can even find a 10.5:1 non forged piston it wouldn't last long....

http://www.raceeng.com/p-6827-wis-neon-420a875mm1051rings.aspx

Go with forged, you said it yourself you don't want to be buying things that won't work and that will work, but not for long. The link above is a pretty good price on a set of high comp pistons.

 

[95talongirl]

Agreed. DO NOT skimp on internals. With such high compression you'll want a forged piston. Heck, you'll want a forged piston for a lower compression boosted engine. It just gives you a little more wiggle room in the event your tune goes lean....

I personally do not like to tear down engines every 6 months.... so it may cost more up front to get things straightened out and done right, but in the long run it'll save you time and money.

 

[Shake_Zulla]

Just a heads up too, if you are running a high compression piston and boost and living in an area with strick emission laws (like cali) it might be harder to tune. Your best tunning option would be to use MS and if you are required to pass an obd2 check then you would have a problem. Someone may have a better option for you for that compression ratio, however, if you wanted an easier path a lower compression piston like 8.8:1 would be easier.

 

[1g8420a]

Just a heads up too, if you are running a high compression piston and boost and living in an area with strick emission laws (like cali) it might be harder to tune. Your best tunning option would be to use MS and if you are required to pass an obd2 check then you would have a problem. Someone may have a better option for you for that compression ratio, however, if you wanted an easier path a lower compression piston like 8.8:1 would be easier.

Yeah, I am aware of the stupid emission laws of california.... although I have an address in NV I use and, there is no smog. there are ways around smog in ca as well that I am slightly aware of.