New Dyno Numbers
Registered User
Joined: Jun 2001
Posts: 378
From: San Jose
dont listen to most of these guys,it dont sound like anythings wrong with your car. Most LT1's gain about 50HP with just standard boltons, (it seems your missing most of the "standard" **** like 1.6 RR, Cut out, Catback,Headers,LT4KM, TB all that) so with the other bolt ons youll gain AT LEAST 50HP most likely more i mean the stock exhaust manifolds must be the most restricted part of an LT1. It doesnt sound like much is wrong with the car (if anything at all) do headers and catback and report the huge gains then come back and prove these guys wrong.
Registered User
Joined: Apr 2003
Posts: 880
From: Land O Lakes, FL
Originally posted by '94 Bad A Z28
Here is a really big thing for you to consider, get a set of LT's. Edlebrock shorties are the worst shorties available.
Here is a really big thing for you to consider, get a set of LT's. Edlebrock shorties are the worst shorties available.
Registered User
Joined: Aug 2003
Posts: 420
From: brunswick ohio, small burb south of cleveland
QUOTE]Here is a really big thing for you to consider, get a set of LT's. Edlebrock shorties are the worst shorties available.[/QUOTE]
im sorry i dont have any dyno numbers but my shorties are awesome. they bolted right in with no extra hassle. all the bolt holes lined right up. they supplied a good gasket and i have no idea why 94 Bad A Z28 would say they are the worst. dude what are you basing that on? they sound great and SOTP could definately feel the difference. i (like others) have still not seen a dyno post that proved longtubes are better then shorties. someone please prove this point if its out there.
im sorry i dont have any dyno numbers but my shorties are awesome. they bolted right in with no extra hassle. all the bolt holes lined right up. they supplied a good gasket and i have no idea why 94 Bad A Z28 would say they are the worst. dude what are you basing that on? they sound great and SOTP could definately feel the difference. i (like others) have still not seen a dyno post that proved longtubes are better then shorties. someone please prove this point if its out there.
Registered User
Joined: Dec 2003
Posts: 2,724
From: Oklahoma where trees are made of wood.
I dont have a dyno graph but I switched from JBAs with no cat and hooker cat-back to hooker longtubes with a mufflex Y and the same cat-back and gained from a 12.89 @ 108 mph to 12.39 @ 113 mph in my old 93 T/A.
Registered User
Joined: May 2000
Posts: 406
From: Haverhill MA
What does your Air Fuel Ratio look like ?
Two things I would check.
1. Are you getting any knock? Knock will retard that timing real fast. Are you running a LT4 Knock Module ?
2. I would take 10 minutes and clean off the MAF Sener resistors and make sure the rubber intake to the TB is not letting any air in there, I ripped mine from underneath and didnt see all that air going in.
Two things I would check.
1. Are you getting any knock? Knock will retard that timing real fast. Are you running a LT4 Knock Module ?
2. I would take 10 minutes and clean off the MAF Sener resistors and make sure the rubber intake to the TB is not letting any air in there, I ripped mine from underneath and didnt see all that air going in.
Retired
Joined: Oct 1999
Posts: 3,166
From: Inside Uranus
No matter what bolt-ons you put on the car now, they still won't net you a near 100rwhp gain, which your mods would suggest.
You should have at least dropped the muffler to eliminate restrictions in the stock exhaust.
My opinion is this:
Those heads don't flow anywhere close to those numbers... It sounds like a port-match/gasket-match job at the most with MAYBE 230ish cfm peak. Hell...the heads might even be stock...
At a TRUE 274cfm peak (which only a VERY few porters can supply) would net you over 400 rwhp on the stock bottom end.
Mike
You should have at least dropped the muffler to eliminate restrictions in the stock exhaust.
My opinion is this:
Those heads don't flow anywhere close to those numbers... It sounds like a port-match/gasket-match job at the most with MAYBE 230ish cfm peak. Hell...the heads might even be stock...
At a TRUE 274cfm peak (which only a VERY few porters can supply) would net you over 400 rwhp on the stock bottom end.
Mike
Registered User
Joined: Oct 2001
Posts: 2,525
From: SoCal
Originally posted by Kraest
My opinion is this:
Those heads don't flow anywhere close to those numbers... It sounds like a port-match/gasket-match job at the most with MAYBE 230ish cfm peak. Hell...the heads might even be stock...
At a TRUE 274cfm peak (which only a VERY few porters can supply) would net you over 400 rwhp on the stock bottom end.
My opinion is this:
Those heads don't flow anywhere close to those numbers... It sounds like a port-match/gasket-match job at the most with MAYBE 230ish cfm peak. Hell...the heads might even be stock...
At a TRUE 274cfm peak (which only a VERY few porters can supply) would net you over 400 rwhp on the stock bottom end.
Registered User
Joined: Jan 2003
Posts: 1,198
From: NYC
Guys even if the heads were stock (no porting) his # should be higher by 30RWHP at least. I would suggest some basic tune up...Check your air and fuel filter, check if your cat is okay. check if the fuel pump works (psi). Check all plugs and wires and definitely buy LT4KM!!!
Sebastian
Sebastian
Registered User
Joined: Jan 2001
Posts: 2,905
From: Orlando,Fl
Originally posted by dren70
im sorry i dont have any dyno numbers but my shorties are awesome. they bolted right in with no extra hassle. all the bolt holes lined right up. they supplied a good gasket and i have no idea why 94 Bad A Z28 would say they are the worst. dude what are you basing that on? they sound great and SOTP could definately feel the difference. i (like others) have still not seen a dyno post that proved longtubes are better then shorties. someone please prove this point if its out there.
im sorry i dont have any dyno numbers but my shorties are awesome. they bolted right in with no extra hassle. all the bolt holes lined right up. they supplied a good gasket and i have no idea why 94 Bad A Z28 would say they are the worst. dude what are you basing that on? they sound great and SOTP could definately feel the difference. i (like others) have still not seen a dyno post that proved longtubes are better then shorties. someone please prove this point if its out there.
Baising that on Dyno runs.
Edlebrock TES Shorties are the worst shorties, from what I have seen. I have seen cars switch from them to another set of shorties and gain 10hp and 13lbs tq. Also nobody that I know that has them likes them.
Registered User
Joined: Jun 2001
Posts: 378
From: San Jose
i have yet to see an LT1 dyno more than 310RWHP with stock exhaust manifolds NA. I think youll have huge gains with just exhaust + headers. Granted if those heads really do flow 276cfm youre gonna be puttin down some awsome numbers.even if the heads flow 20-30cfm less,theres some big gains to be had with an up graded exhaust system.
Registered User
Joined: Jan 2001
Posts: 2,905
From: Orlando,Fl
Originally posted by MauriSSio
i have yet to see an LT1 dyno more than 310RWHP with stock exhaust manifolds NA. I think youll have huge gains with just exhaust + headers. Granted if those heads really do flow 276cfm youre gonna be puttin down some awsome numbers.even if the heads flow 20-30cfm less,theres some big gains to be had with an up graded exhaust system.
i have yet to see an LT1 dyno more than 310RWHP with stock exhaust manifolds NA. I think youll have huge gains with just exhaust + headers. Granted if those heads really do flow 276cfm youre gonna be puttin down some awsome numbers.even if the heads flow 20-30cfm less,theres some big gains to be had with an up graded exhaust system.
I will...
I want to dyno over 310 (just because you said you've never seen it done) and run 12's N/A with just bolt ons and stock manifolds.
Thread Starter
Registered User
Joined: Jan 2004
Posts: 52
Dyno Graph
Ok everybody, here is a link to my a pic of my dyno graph. Some of you seen to think I have stock maifolds, yet they are edelbrock shorty headers. I do have the LT4KM, also G&G Engines in Tomball, Tx did the port work on the stock heads. Should I do a cylinder pressure test, check the opti, cats???? Its got new plugs and wires. Would it being throwing any codes for something really wrong in the engine??? Any ideas?Dyno Graph
Last edited by Laser96Ws6; Feb 3, 2004 at 02:50 PM.
Registered User
Joined: Jan 2001
Posts: 2,905
From: Orlando,Fl
Re: Dyno Graph
Originally posted by Laser96Ws6
Ok everybody, here is a link to my a pic of my dyno graph. Some of you seen to think I have stock maifolds, yet they are edelbrock shorty headers. I do have the LT4KM, also G&G Engines in Tomball, Tx did the port work on the stock heads. Should I do a cylinder pressure test, check the opti, cats???? Its got new plugs and wires. Would it being throwing any codes for something really wrong in the engine??? Any ideas?Dyno Graph
Ok everybody, here is a link to my a pic of my dyno graph. Some of you seen to think I have stock maifolds, yet they are edelbrock shorty headers. I do have the LT4KM, also G&G Engines in Tomball, Tx did the port work on the stock heads. Should I do a cylinder pressure test, check the opti, cats???? Its got new plugs and wires. Would it being throwing any codes for something really wrong in the engine??? Any ideas?Dyno Graph
You must be a member to view the pic... hit me up on AIM and send me the pic, I will host it for you... NX LT1 Z28
