Pennock's Fiero Forum
  Technical Discussion & Questions - Archive
  N*/Aurora gurus...lend me your ears...

T H I S   I S   A N   A R C H I V E D   T O P I C
  

Email This Page to Someone! | Printable Version


N*/Aurora gurus...lend me your ears... by RCR
Started on: 03-14-2007 03:42 PM
Replies: 8
Last post by: ryan.hess on 03-17-2007 05:24 PM
RCR
Member
Posts: 4416
From: Shelby Twp Mi
Registered: Sep 2002


Feedback score:    (7)
Leave feedback





Total ratings: 102
Rate this member

Report this Post03-14-2007 03:42 PM Click Here to See the Profile for RCRSend a Private Message to RCRDirect Link to This Post

I've got this crazy idea brewing about putting a turbo on the Aurora project I have pending. How much boost can you safely put on one these engines, if any, without going through the engine? I was looking at 6PSI +/-2PSI for beginners...

thanx,
Bob
IP: Logged
PFF
System Bot
Fiero STS
Member
Posts: 2045
From: Wyoming, MN. usa
Registered: Nov 2001


Feedback score: (1)
Leave feedback





Total ratings: 67
Rate this member

Report this Post03-14-2007 04:27 PM Click Here to See the Profile for Fiero STSSend a Private Message to Fiero STSDirect Link to This Post
Your motor has a CR of 10:1, or there abouts, so it is not going to be very boost friendly. The head gaskets have been an issue on non boosted engines , so they may need an upgrade. And I would replace the headbolts with studs or at least go to the bigger N* bolts. Also you will need a programable ECM to be able to compensate for the boost. I would try Ryan Hess for that.

------------------

Signature courtesy of MinnGreen.

IP: Logged
AP2k
Member
Posts: 2408
From:
Registered: May 2006


Feedback score: N/A
Leave feedback

Rate this member

Report this Post03-14-2007 04:32 PM Click Here to See the Profile for AP2kSend a Private Message to AP2kDirect Link to This Post
The head gaskets can be dealt with, although boosting such a high compression engine is going to make it close. Sheet steel gaskets are what LT3 gurus recommend on their engines which were very notorious for eating stock head gaskets. I am sure there are some headgaskets available for that engine that will be able to withstand the pressure.
IP: Logged
ryan.hess
Member
Posts: 20784
From: Orlando, FL
Registered: Dec 2002


Feedback score: (1)
Leave feedback





Total ratings: 319
Rate this member

Report this Post03-14-2007 04:40 PM Click Here to See the Profile for ryan.hessSend a Private Message to ryan.hessDirect Link to This Post
6-8psi intercooled is about perfect for a stock engine.

There is a guy on the cadillac forums that has a turbo northstar with a tiny turbo..... He is running 7psi. The loss through the auto probably puts him at 500 crank hp. A better turbo would get more power at the same boost levels.

IP: Logged
ryan.hess
Member
Posts: 20784
From: Orlando, FL
Registered: Dec 2002


Feedback score: (1)
Leave feedback





Total ratings: 319
Rate this member

Report this Post03-14-2007 04:48 PM Click Here to See the Profile for ryan.hessSend a Private Message to ryan.hessDirect Link to This Post

ryan.hess

20784 posts
Member since Dec 2002
Also, with regards to the other issues that have been bought up.....

A stock northstar will run 87 octane just fine. That's with 10.3:1 compression. That's the magic of the northstar's heads.

It will take intercooled(!) boost fine.

Head gaskets aren't really an issue. Use the coolant supplement and you'll be fine.

Head bolts aren't an issue.

The block threads are an issue whether you turbo it or not. With a used engine you're taking a roll of the dice. If you don't want to take it out again after the engine is in, you should timesert the block. The added stresses brought about by boost are nil compared to the thermal stresses that are in play every time the engine is warmed up. The thermal cycling and work hardening of the aluminum threads are what cause them to pull from the block. The later northstars used finer and longer thread engagement to stop this problem. You don't hear about "headgasket problems" on them.
IP: Logged
RCR
Member
Posts: 4416
From: Shelby Twp Mi
Registered: Sep 2002


Feedback score:    (7)
Leave feedback





Total ratings: 102
Rate this member

Report this Post03-17-2007 07:04 AM Click Here to See the Profile for RCRSend a Private Message to RCRDirect Link to This Post
Thanx guys...Good info (a little conflicting, but good).

Bob
IP: Logged
cptsnoopy
Member
Posts: 2585
From: phoenix, AZ, USA
Registered: Jul 2003


Feedback score:    (8)
Leave feedback





Total ratings: 60
Rate this member

Report this Post03-17-2007 10:46 AM Click Here to See the Profile for cptsnoopySend a Private Message to cptsnoopyDirect Link to This Post
I was thinking about this also and was considering the Aurora block with vin-9 N* heads. That should drop the compression to somewhere just over 9:1. Alan at chrfab.com has probably gone through all of this already at his shop.
IP: Logged
RCR
Member
Posts: 4416
From: Shelby Twp Mi
Registered: Sep 2002


Feedback score:    (7)
Leave feedback





Total ratings: 102
Rate this member

Report this Post03-17-2007 01:01 PM Click Here to See the Profile for RCRSend a Private Message to RCRDirect Link to This Post
After reading this post: https://www.fiero.nl/forum/Forum2/HTML/081025.html , it looks like an intercooler won't be helpful. Although, I suppose, one could just increase the boost to compensate...

Bob
IP: Logged
ryan.hess
Member
Posts: 20784
From: Orlando, FL
Registered: Dec 2002


Feedback score: (1)
Leave feedback





Total ratings: 319
Rate this member

Report this Post03-17-2007 05:24 PM Click Here to See the Profile for ryan.hessSend a Private Message to ryan.hessDirect Link to This Post
7 psi intercooled will give you more power than 7psi non-intercooled

You also won't have to run 110 octane to fight detonation.

Unless you're running low compression pistons, I wouldn't think of it as an option.
IP: Logged



All times are ET (US)

T H I S   I S   A N   A R C H I V E D   T O P I C
  

Contact Us | Back To Main Page

Advertizing on PFF | Fiero Parts Vendors
PFF Merchandise | Fiero Gallery
Real-Time Chat | Fiero Related Auctions on eBay



Copyright (c) 1999, C. Pennock