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Re: 88 G20 slow resurrection [Re: Juntao_DW] #751758
August 20th 2019 11:07 am
August 20th 2019 11:07 am
Joined: Mar 2019
Posts: 59
Riverdale, new jersey, united ...
J
Juntao_DW Offline OP
journeyman
Juntao_DW  Offline OP
journeyman
J
Joined: Mar 2019
Posts: 59
Riverdale, new jersey, united ...
Most of the information for TBI mods i got from several camaro and off road forums, https://www.thirdgen.org/ultimatetbi2/ this is a quick read into it. http://tbichips.com/?page_id=217 this is some pics and info for what needs to be ground down. It supposedly adds 50cfm of air flow or so, is there any benefit i couldn't tell you. Van is sadly 3months to a year from being on the road depends on how much work i have comming and money i have to burn. My tbi swapped LT1 s10 only has a fuel spacer in it. that being a 350 and it can idle all day through town it gets 16-17mpg city which for a Lt1 v8 in an s10 with a/c on thats good enough for me. Harris performance has a lot of info for tuning tbi engines most of it applies to 350's as everyone seems to think 305's are junk, but im looking for an interstate cruiser i want to touch every last bit of the lower 48 and maybe one day hit alaska in the van too, so my main focus is fuel economy. I know 5.3 and a 4l80e would do it justice in that dept and power, but it wouldnt be my dad's van anymore call me sentimental.
https://www.amazon.com/Throttle-Bod...qid=1566313886&s=gateway&sr=8-16
this is the spacer i bought beings all it does it lift the fuel pod over the throttle body, i used the least expensive one i couldnt justify spending over 30 bucks on something unproven to me.

Last edited by Juntao_DW; August 20th 2019 11:12 am.
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Re: 88 G20 slow resurrection [Re: Juntao_DW] #751759
August 20th 2019 1:03 pm
August 20th 2019 1:03 pm
Joined: Feb 2018
Posts: 140
Cedar Rapids, Iowa
Just4fun1991 Offline
member
Just4fun1991  Offline
member
Joined: Feb 2018
Posts: 140
Cedar Rapids, Iowa
Interesting!

I guess I am more familiar with the Tune Port Injection / TPI than I am to the TBI motors. My 1988 Iroc was a TPI and I did what I could to increase all the ponies without getting into the motor.

I am going to guess that since you did the mods, that you may be running a K&N filter at some point in time to help with more air?

Re: 88 G20 slow resurrection [Re: Juntao_DW] #751762
August 20th 2019 2:11 pm
August 20th 2019 2:11 pm
Joined: Mar 2019
Posts: 59
Riverdale, new jersey, united ...
J
Juntao_DW Offline OP
journeyman
Juntao_DW  Offline OP
journeyman
J
Joined: Mar 2019
Posts: 59
Riverdale, new jersey, united ...
tbi's are a lost cause for efficiency and power in most cases, but reliability and torque they do very well with. Exhaust is a big gain for power and torque on these motors the factory y pipes are typically a huge choke point. Not sure on an air cleaner yet, contemplating swapping to an electric fan and maybe making a cold air some how, maybe adding a duct behind the headlight and route the intake into that area, headers are going to add alot of heat in the engine compartment so i'll have to do something or it'll heat soak.

Re: 88 G20 slow resurrection [Re: Juntao_DW] #751763
August 20th 2019 2:49 pm
August 20th 2019 2:49 pm
Joined: Feb 2018
Posts: 140
Cedar Rapids, Iowa
Just4fun1991 Offline
member
Just4fun1991  Offline
member
Joined: Feb 2018
Posts: 140
Cedar Rapids, Iowa

I have thought about the route you're taking. Thought and have come to a decision, that I am going to ride my 1991 TBI 350 out until something big happens and then do an LS Swap like JAGI410 did on his 1984. BUUU-TEEEE-FULL.....

I have wanted to add headers to the van, but not sure they would work on the LS swap (guessing they will, from a 5.7 to a 5.3)
I will have them "ceramic coated" inside and out to help with cutting down on the heat...

Re: 88 G20 slow resurrection [Re: Juntao_DW] #751765
August 20th 2019 3:19 pm
August 20th 2019 3:19 pm
Joined: Mar 2019
Posts: 59
Riverdale, new jersey, united ...
J
Juntao_DW Offline OP
journeyman
Juntao_DW  Offline OP
journeyman
J
Joined: Mar 2019
Posts: 59
Riverdale, new jersey, united ...
i'm pretty sure that the patterns for bolting the headers to the block are different on the older non ls based motors, if you're fully intending to do an ls swap i say go for it awesome reliability for cheap by todays standards. for the 350 do a 2.5" y pipe it'll wake it up enough that you could probably bypass spending coin on headers. Shop truck was a cheap parts runner that i threw together and the van is sentimental so it's going to stay a 305 for until that dies. This is the ypipe on my shop truck, the van will probably get true duals out before the rear wheels on both sides.
[Linked Image]

Re: 88 G20 slow resurrection [Re: Juntao_DW] #751788
August 21st 2019 9:54 am
August 21st 2019 9:54 am
Joined: Mar 2019
Posts: 59
Riverdale, new jersey, united ...
J
Juntao_DW Offline OP
journeyman
Juntao_DW  Offline OP
journeyman
J
Joined: Mar 2019
Posts: 59
Riverdale, new jersey, united ...
Not a lot of work done last night installed locking header bolts finished up routing the driver side wires put some heat socks on the ends and tightening the spark plugs, didnt have a socket that would fit under the runners on the passenger side to tighten them. So i stopped for the night.
[Linked Image]
[Linked Image]
edit: ordered my bullet converters for the exhaust as well as some get loud goodies. Still not sure what mufflers i want to run something quiet i plan to do a lot of cruising in this, but not oem want it to be stainless so it'll last a long time.

Last edited by Juntao_DW; August 21st 2019 9:55 am.
Re: 88 G20 slow resurrection [Re: Juntao_DW] #751867
August 24th 2019 12:28 pm
August 24th 2019 12:28 pm
Joined: Aug 2002
Posts: 14,262
Lake City Florida, United Stat...
lukester Offline
Supreme Master
lukester  Offline
Supreme Master
Joined: Aug 2002
Posts: 14,262
Lake City Florida, United Stat...
Nice work man.


[Linked Image]

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Re: 88 G20 slow resurrection [Re: Juntao_DW] #751883
August 25th 2019 7:30 am
August 25th 2019 7:30 am
Joined: Feb 2002
Posts: 26,504
Pittsburgh,Pa USA
newkirkinc1 Offline
Old Timer
newkirkinc1  Offline
Old Timer
Joined: Feb 2002
Posts: 26,504
Pittsburgh,Pa USA
Lookin good.


Jim & Lucy Newkirk
1965 Chevy Bad Influence
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2012 Chevy Van
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Re: 88 G20 slow resurrection [Re: Juntao_DW] #752164
September 04th 2019 7:37 am
September 04th 2019 7:37 am
Joined: Mar 2019
Posts: 59
Riverdale, new jersey, united ...
J
Juntao_DW Offline OP
journeyman
Juntao_DW  Offline OP
journeyman
J
Joined: Mar 2019
Posts: 59
Riverdale, new jersey, united ...
Had a bit of time last night between tearing down a customers truck and waiting on parts, so this week i should have some decent progress being made, if the weather holds out van is outside unfortunately but i cant fit it in my garage space i'm renting.
finished routing the bank 2 wires
[Linked Image]
mocked up the one side of the true dual exhaust, up on the fence if i want true duals or if i should add an x pipe in the system. It should pick up more midrange torque with an x pipe, but thats another 180 in pipes and it'll move the positioning of the mufflers further back which may make it harder to route out before the rear tires. Although this should be easy to remove and modify if i change my mind later down the road. It's a bullet converter with an electronic cut out to a thrush turbo muffler.
[Linked Image]
[Linked Image]
also painted a few brackets and the oil fill tube quicly in the bed of the shop truck....end of the night after clean up figured why not, not like i care about the finish all that much its a shop truck
[Linked Image]
this is where i left off on the customers truck, it was suppose to be a simple motor replacement, which is why i left the harness and fuel lines in place, but now it's getting an ls1 t56 supposedly... i'll see what he drops off for me at the shop saturday.
[Linked Image]

Re: 88 G20 slow resurrection [Re: Juntao_DW] #752167
September 04th 2019 10:30 am
September 04th 2019 10:30 am
Joined: Feb 2018
Posts: 140
Cedar Rapids, Iowa
Just4fun1991 Offline
member
Just4fun1991  Offline
member
Joined: Feb 2018
Posts: 140
Cedar Rapids, Iowa
Juntao

You have gone from MacGyver to MacWrench! Looking good. Are you installing cutouts in the exhaust?

Bob

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