Boost and a L27? - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

Reply
 
 
 
Thread Tools Search this Thread
Old 03-01-2005, 01:50 PM   #11
Senior Member
Certified GM nut
Thread Starter
 
Join Date: Jul 2004
Location: New York City
Posts: 1,912
Thanks: 0
Thanked 0 Times in 0 Posts
OLDsman105 is on a distinguished road
Default

Quote:
Originally Posted by jr's3800
Quote:
Originally Posted by OLDsman105
Quote:
It'* been 8.5:1 the whole run. No change in compression.
http://engine.firebirdv6.com/3800history.html

In the middle of the histoy it says

Quote:
Roller rocker arms, a higher compression ratio, and reduced piston ring tension improved efficiency in 1993.
A higher cpmpression ratio was incorrect.... It was and is 8.5 to 1 for all 1988-95 Vin C, L and 1 engines..... I don't know where they got that info from but there was no change in compression.. Only lower friction piston rings, and roller rockers were the changes for 93..




Now the 3.0 and later 3300 Buick V6'* did use 9.0 to 1 compression... The only change in compression for the 3800 was with the Vin K engine to 9.4 to 1...<---- That they got correct...

I have seen a few sites that have flawed info...


Well there goes my research. Anyway in order to tune the air fuel ratio I will need a AFC 2.0 and a scanner I'm assuming. Would putting on a L67 series 1 throttle body help or hinder the process? And will the L27 injectors hold up or will I have to upgrade the injectors also.
OLDsman105 is offline   Reply With Quote
Old 03-01-2005, 02:50 PM   #12
Senior Member
True Car Nut
 
Join Date: Dec 2002
Location: Halifax, Canada 91SSE / 97SSEi
Posts: 5,857
Thanks: 0
Thanked 0 Times in 0 Posts
Merlin 91/97 is on a distinguished road
Default

http://www.turbofast.com.au/javacalc.html

Might be something you want to check out.....
Merlin 91/97 is offline   Reply With Quote
Old 03-01-2005, 03:03 PM   #13
Senior Member
Certified Car Nut
 
Join Date: Jun 2003
Posts: 15,928
Thanks: 0
Thanked 0 Times in 0 Posts
BonneMeMN is on a distinguished road
Default

Funny, you were at the ******* "meeting".

i'm going to keep my opinion out of this now, and i'll just give you some advice. Read the link that was posted above.

http://www.bonnevilleclub.com/forum/...b958873#264116

Quote:
Originally Posted by Dr. Jay
I was just talking to Will (Bill ) and decided to look up cranks. GM parts direct lists the crank as PN: 24501594 for All application models. Unless there'* some database error that means naturally aspriated and supercharged is the same...which logically would be the case anyway.
BonneMeMN is offline   Reply With Quote
Old 03-01-2005, 03:37 PM   #14
Senior Member
True Car Nut
 
Join Date: May 2003
Location: Holt, MI & Lima, OH
Posts: 3,022
Thanks: 0
Thanked 0 Times in 0 Posts
dbtk2 is on a distinguished road
Default

Quote:
Originally Posted by big_news_1
Quote:
Originally Posted by BonneMeMN
8.5:1 compression ratio
dished pistons
forged crank
shot peened rods. (l67 has forged rods & pistons afawk)
I know I'm S2, but I don't think I even have a forged crank. If you read up on ZZP'* L36 stroker kit, they say that the stroker crank is a reworked stock crank. Then they go on to say that they got the crank to snap in half when they boosted it up to ~375 whp. That sounds too low for a forged crank. So if the L36 crank isn't forged, I'd guess the L27 isn't, either?
I'm not saying that the L27 or L36 crank is forged, but the strocker kit has a reworked stock crank meaning it isn't as strong as it would've been before hand. I know that an L36 crank can handle over 400whp because Zooomer runs an L36 bottom end on his car, and Digital Kens car also has a L36 block, and so does their mid 11 second Turbo GT.

However, if it can handle 375whp thats probably more than anyone here is looking for. 375whp is WELL over 400 crank hp.

Personally, I wouldn't worry about the bottom end of an L27 unless I was making over 400hp.

Shawn
dbtk2 is offline   Reply With Quote
Old 03-01-2005, 03:47 PM   #15
Senior Member
True Car Nut
 
Join Date: Jun 2004
Location: Glendale, AZ
Posts: 3,459
Thanks: 0
Thanked 1 Time in 1 Post
big_news_1 is on a distinguished road
Default

Gotcha.... I was just debating whether it was forged or not. But you're right; the ability to handle over 400 crank hp is more headroom than anybody here requires.... at least at this point in time.
big_news_1 is offline   Reply With Quote
Old 03-01-2005, 03:52 PM   #16
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

Quote:
Originally Posted by BonneMeMN
Funny, you were at the f*** "meeting".

i'm going to keep my opinion out of this now, and i'll just give you some advice. Read the link that was posted above.

http://www.bonnevilleclub.com/forum/...b958873#264116

Quote:
Originally Posted by Dr. Jay
I was just talking to Will (Bill ) and decided to look up cranks. GM parts direct lists the crank as PN: 24501594 for All application models. Unless there'* some database error that means naturally aspriated and supercharged is the same...which logically would be the case anyway.
Nothing there was ever confirmed. We have suspicions, but unless we get someone who knows what they're looking for to tear down both engines, we're not going to know. I know both engines pretty well myself, and DrJay has done more research on this than anyone, and we still can't figure out what'* rumor and what'* fact.

Boldly stating what you did is a little touchy.
willwren is offline   Reply With Quote
Old 03-01-2005, 03:55 PM   #17
Senior Member
Certified GM nut
Thread Starter
 
Join Date: Jul 2004
Location: New York City
Posts: 1,912
Thanks: 0
Thanked 0 Times in 0 Posts
OLDsman105 is on a distinguished road
Default

Ok so from all the information I've read here

1.My L27 bottom end will withstand the extra horsepower
2.5 to 6 pounds of boost is possible with little tuning.
3.my compression information was wrong (I apoligize for that)
4.the bottom end is still under debate I think

Will I need to upgrade my injectors for 4 to 5 pounds of boost?

And what meeting are you guys refering to anyway?
OLDsman105 is offline   Reply With Quote
Old 03-01-2005, 03:59 PM   #18
Sol
Senior Member
True Car Nut
 
Join Date: Sep 2002
Posts: 8,909
Thanks: 0
Thanked 0 Times in 0 Posts
Sol is on a distinguished road
Default

Does it really matter if the crank is forged or not? Seriously.

The original question asks if the L27 handles boost. And yes, it does. You shouldn't need to upgrade your injectors with that low amount of boost.
Sol is offline   Reply With Quote
Old 03-01-2005, 04:01 PM   #19
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

Quote:
Originally Posted by OLDsman105
Ok so from all the information I've read here

1.My L27 bottom end will withstand the extra horsepower
2.5 to 6 pounds of boost is possible with little tuning.
3.my compression information was wrong (I apoligize for that)
4.the bottom end is still under debate I think

Will I need to upgrade my injectors for 4 to 5 pounds of boost?

And what meeting are you guys refering to anyway?
1. Jason says so, others may agree. Never done, never proven. Risky.

2. Jason says so, but it'* not that simple. You'll have work to do, so buy a good scantool, and set aside alot of extra cash for custom PCM and AFC controller.

3. Compression is as jr's3800 stated.

4. May not ever be settled, especiallty with mis-information and assumptions being posted. More research is needed, but there are KNOWN differences. How much of an effect those differences will make is unknown. Refer to answer #1.
willwren is offline   Reply With Quote
Old 03-01-2005, 04:02 PM   #20
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

Oops. You have a 90? You don't have an L27, bud.
willwren is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Low boost, no boost problem immusicman Forced Induction 12 09-27-2009 01:05 AM
Boost Control Solenoid Maintenance and Boost Control Actuator Test for low Boost* Toddster Trouble shooting + Test Procedures 0 03-21-2009 07:24 PM
More boost via boost controller... DanCulkin Performance, Brainstorming & Tuning 14 07-02-2007 12:02 PM
LIM porting and the L27? pic requests. Marik_bathory Performance, Brainstorming & Tuning 6 03-28-2007 08:59 PM
low stock Boost vs high stock boost hvactech Performance, Brainstorming & Tuning 12 05-10-2005 11:14 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 01:52 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.