Bigger injectors?
05-11-2005, 04:54 PM
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Car: 91 Firebird
Engine: 3.1 V6
Transmission: TH-700-R4
Bigger injectors?
Would these work ok with a lightly modified 3.1?
http://truckperformance.com/products...bddb55eeb197fc
http://truckperformance.com/products...bddb55eeb197fc
05-11-2005, 11:29 PM
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Car: 88 Firebird, 86 T/A
Engine: 3.1/305 short block
Transmission: 700r4 w/ transgo, vette servo/700r4
Originally posted by 91greenbird
3.1's had 15 pound injectors 3.4 had 17 pound
3.1's had 15 pound injectors 3.4 had 17 pound
05-12-2005, 12:12 PM
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Car: 1991 Firebird
Engine: V6
Transmission: ATOD
05-12-2005, 01:23 PM
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Car: 87 Red/Blk Bird loaded 3.4L & 700R4
Transmission: Th700R4
Axle/Gears: 3.73
Originally posted by dodger65
what about the 2.8's?
what about the 2.8's?
I have 19s with my 3.4 and I need a tune bad to run with them...the exhaust reaks of fuel! 19s are a bit strong w/o a good custom chip! I got mine out of a ford in a junk yard & had rich @ cruzin performance clean and blue print them! That would be the best $ way to go!
05-12-2005, 02:06 PM
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Car: 91 Camaro
Engine: 3.1...not hardly stock
Transmission: 700r4....not stock either
Axle/Gears: 3.73
I thought 2.8s got 13s. I am still running stock injectors in my motor... I need to do some datalogging to see if I need something a little bigger but it doesn't really act like it does. I've got a set of 19s if I need them, though.
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05-12-2005, 02:45 PM
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Car: 1992 Camaro RS
Engine: 5.0L TBI
Transmission: 700R4
Axle/Gears: 2.73
I know for a fact that 2.8L engines use 15 pph injectors.
Anyhow, I just got my cleaned and flow-tested 2.8L injectors back from Rich Jensen at CruzinPerformance.com. After Rich's excelent job of cleaning them, the data sheet shows 5 of the injectors flow 15.57 pph and #6 flows 15.39 pph. Before cleaning they were within 5-6% flow of each other (after 117,000 miles) - after cleaning they are all within 1-1.5% of each other with improved spray patterns (on Rich's scale of Good/Fair/Poor, they are now rated Good where before they were rated Fair).
I just put them back in the car this last weekend, but I haven't started or driven it yet. I need to replace the fuel filter (it's a good idea to do so after new/cleaned injectors, and besides, it's due any way).
(Also note that my car is an '89 Camaro RS - I fully expected the injectors to be Multecs - but when I pulled them, they were Bosch pintle-style. I wonder if they had been replaced at some point in the past...I thought '89s came with Multecs. Not that I mind, Rich will actually clean the Bosch style, I hear he won't bother with the Multecs sometimes.)
*Edited: To remove the "In that case, I would think that 3.1L engines use 17 pph injectors..." comment - see redraif's post below.
Anyhow, I just got my cleaned and flow-tested 2.8L injectors back from Rich Jensen at CruzinPerformance.com. After Rich's excelent job of cleaning them, the data sheet shows 5 of the injectors flow 15.57 pph and #6 flows 15.39 pph. Before cleaning they were within 5-6% flow of each other (after 117,000 miles) - after cleaning they are all within 1-1.5% of each other with improved spray patterns (on Rich's scale of Good/Fair/Poor, they are now rated Good where before they were rated Fair).
I just put them back in the car this last weekend, but I haven't started or driven it yet. I need to replace the fuel filter (it's a good idea to do so after new/cleaned injectors, and besides, it's due any way).
(Also note that my car is an '89 Camaro RS - I fully expected the injectors to be Multecs - but when I pulled them, they were Bosch pintle-style. I wonder if they had been replaced at some point in the past...I thought '89s came with Multecs. Not that I mind, Rich will actually clean the Bosch style, I hear he won't bother with the Multecs sometimes.)
*Edited: To remove the "In that case, I would think that 3.1L engines use 17 pph injectors..." comment - see redraif's post below.
Last edited by LinuxGuy; 05-12-2005 at 05:35 PM.
05-12-2005, 03:14 PM
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Car: 87 Red/Blk Bird loaded 3.4L & 700R4
Transmission: Th700R4
Axle/Gears: 3.73
Originally posted by LinuxGuy
I know for a fact that 2.8L engines use 15 pph injectors. In that case, I would think that 3.1L engines use 17 pph injectors...
Anyhow, I just got my cleaned and flow-tested 2.8L injectors back from Rich Jensen at CruzinPerformance.com. After Rich's excelent job of cleaning them, the data sheet shows 5 of the injectors flow 15.57 pph and #6 flows 15.39 pph. Before cleaning they were within 5-6% flow of each other (after 117,000 miles) - after cleaning they are all within 1-1.5% of each other with improved spray patterns (on Rich's scale of Good/Fair/Poor, they are now rated Good where before they were rated Fair).
I just put them back in the car this last weekend, but I haven't started or driven it yet. I need to replace the fuel filter (it's a good idea to do so after new/cleaned injectors, and besides, it's due any way).
(Also note that my car is an '89 Camaro RS - I fully expected the injectors to be Multecs - but when I pulled them, they were Bosch pintle-style. I wonder if they had been replaced at some point in the past...I thought '89s came with Multecs. Not that I mind, Rich will actually clean the Bosch style, I hear he won't bother with the Multecs sometimes.)
I know for a fact that 2.8L engines use 15 pph injectors. In that case, I would think that 3.1L engines use 17 pph injectors...
Anyhow, I just got my cleaned and flow-tested 2.8L injectors back from Rich Jensen at CruzinPerformance.com. After Rich's excelent job of cleaning them, the data sheet shows 5 of the injectors flow 15.57 pph and #6 flows 15.39 pph. Before cleaning they were within 5-6% flow of each other (after 117,000 miles) - after cleaning they are all within 1-1.5% of each other with improved spray patterns (on Rich's scale of Good/Fair/Poor, they are now rated Good where before they were rated Fair).
I just put them back in the car this last weekend, but I haven't started or driven it yet. I need to replace the fuel filter (it's a good idea to do so after new/cleaned injectors, and besides, it's due any way).
(Also note that my car is an '89 Camaro RS - I fully expected the injectors to be Multecs - but when I pulled them, they were Bosch pintle-style. I wonder if they had been replaced at some point in the past...I thought '89s came with Multecs. Not that I mind, Rich will actually clean the Bosch style, I hear he won't bother with the Multecs sometimes.)
Well poor rich has done some fun ones for me...ford 19#s & my stock cold start injector. He also did my Nissan injectors! I will probably be sending him my fiero ones too!
05-12-2005, 05:32 PM
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Car: 1992 Camaro RS
Engine: 5.0L TBI
Transmission: 700R4
Axle/Gears: 2.73
Originally posted by redraif
Well if you used that logic, the 3.4 would have been 19s & they are not! I'm sure it was 15 in both the 3.1 and 2.8...then 17s in the 3.4!
Well if you used that logic, the 3.4 would have been 19s & they are not! I'm sure it was 15 in both the 3.1 and 2.8...then 17s in the 3.4!
Well poor rich has done some fun ones for me...ford 19#s & my stock cold start injector.
05-12-2005, 05:46 PM
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Car: 87 Red/Blk Bird loaded 3.4L & 700R4
Transmission: Th700R4
Axle/Gears: 3.73
Originally posted by LinuxGuy
Oh, ok.
Rich will clean and flow test the cold start injector? Oh. I didn't know that...I didn't pull mine when I sent the injectors in, is it really similar to a regular injector? Hmmm...I guess the cold start is a top-feed injector isn't it? And Rich's page does say he cleans top-feed style injectors.
Oh, ok.
Rich will clean and flow test the cold start injector? Oh. I didn't know that...I didn't pull mine when I sent the injectors in, is it really similar to a regular injector? Hmmm...I guess the cold start is a top-feed injector isn't it? And Rich's page does say he cleans top-feed style injectors.
05-12-2005, 06:16 PM
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Car: 87 Red/Blk Bird loaded 3.4L & 700R4
Transmission: Th700R4
Axle/Gears: 3.73
tried to run a search to see what the 2.8s came with...seems every post says...13s...no 15s...no 13s...no 15s! 
Who knows! This can be so frustrating! The funny thing is I had the 19#ers on the 2.8 for a while, before I got the 3.4 installed...talk about overkill!
Who knows! This can be so frustrating! The funny thing is I had the 19#ers on the 2.8 for a while, before I got the 3.4 installed...talk about overkill!
05-12-2005, 06:25 PM
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Car: 88 Firebird, 86 T/A
Engine: 3.1/305 short block
Transmission: 700r4 w/ transgo, vette servo/700r4
Originally posted by redraif
tried to run a search to see what the 2.8s came with...seems every post says...13s...no 15s...no 13s...no 15s! Who knows! This can be so frustrating! The funny thing is I had the 19#ers on the 2.8 for a while, before I got the 3.4 installed...talk about overkill!
tried to run a search to see what the 2.8s came with...seems every post says...13s...no 15s...no 13s...no 15s!
Who knows! This can be so frustrating! The funny thing is I had the 19#ers on the 2.8 for a while, before I got the 3.4 installed...talk about overkill! 1) did ya ever notice that amongst the discount parts store catalogs, all the injector p/n's seem to supersede to a universal 60deg v6 injector, making it seem that they would all work? compounded by
2) regardless of the #/hr rating of the injector, even if one flows more than another at a given pulse width, won't the computer narrow the pulse width until 14.7:1 (or close) is reached? making the #/hr rating pertinent only when the cylinder filling characteristics are altered? (i.e. porting, cam swap, different intake/tb)
these are just a couple of things that bubbled up in my mind while i was reading this thread. i'm not saying i'm right--this is just what i came up with. what do y'all think? i do accept differing opinions...
05-13-2005, 03:24 PM
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Car: 1986 Firebird
Engine: 2.8 V6
Transmission: 700R4
It'd be great if we could just cross-reference the part # stamped on the injector, then we'd know for sure what they were.
I think only 90-92 Gen 1 3.1's and all 85-up Gen 2 V6's got Multecs. My Multec set came from a 90 3.1. Every Gen 2 block I looked at (2.8 or 3.1) had Multecs... the only Bosch's I could find were in our Gen 1 2.8's.
I think only 90-92 Gen 1 3.1's and all 85-up Gen 2 V6's got Multecs. My Multec set came from a 90 3.1. Every Gen 2 block I looked at (2.8 or 3.1) had Multecs... the only Bosch's I could find were in our Gen 1 2.8's.
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