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| LS4 / F40 swap - fieroguru (Page 140/216) |
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Rickady88GT
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JAN 04, 10:55 PM
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| quote | Originally posted by fieroguru:
No, they are cast iron.
No, this is only the front calipers. There isn't a matching rear caliper with parking brake.
There wasn't much interested in this setup, so I have put it on the back burner for now. May revisit in another year or two. |
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I understand. A viable replacement for the original Fiero equipment is starting to look more necessary than "performance oriented" as each year goes by. I just don't like the looks of iron, even on the new Corvettes. Honestly, I am a HUGE fan of the Camaro and CTS V "Brembo" calipers. For some reason they just look VERY good. But the weight of the rotors is a huge drawback. They are massive.[This message has been edited by Rickady88GT (edited 01-04-2019).]
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fieroguru
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JAN 06, 06:09 PM
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After nearly 6 years and 48K miles, I have grown bored with the meager 382 whp from my original LS4/F40 swap, so I will be pulling the drivetrain in the coming weeks for the next round of upgrades and refinements.
The current upgrade list:
1. DoD delete - all needed parts are now sitting on the shelf.
2. Camshaft upgrade/downgrade. Current one is 224/231 .564/.575 @ 113 and DoD compatible with lazy lobes. The new one is Tick Stage 2 Turbo camshaft for the 4.8/5.3L engines. Its specs are: 219/223 .617/.595 LSA114+3. So more lift, less duration and less overlap. I am hoping it gives be about 25 lb-ft more torque in the lower end and should give me a good shot of breaking 30 mpg with the 3.09 final drive. It also sets me up for the future turbo upgrade in 2020. Camshaft, BTR springs and upgraded pushrods sitting on the shelf.
3. Dorman LS2 intake manifold. This has shown to be slightly better than the LS6 version, so it should free up a few more hp vs. the current stock LS2 intake. Again, this is a supporting mod for the future turbo upgrade as my stock LS2 intake has a hole in the bottom side the clear the DoD connector, and this patch plate isn't boost friendly. Dorman intake is sitting on the shelf.
4. Flex fuel conversion. Flex fuel sensor and the Fierostore stainless steel sender are on the shelf. I will also modify my spare 88 fuel tank with a higher vent tube to further increase its capacity. Supporting mod for running E85 with the turbo, but the flex fuel sensor will also allow me to take road trips in the car without worry of finding E85 gas stations (one is about 1.5 miles from the house). Even with the negative impact to MPG, my overall cost per mile should be less when you compare the E85 price to 93 premium.
5. Rework as many brackets, mounts, and smooth firewall panel in aluminum to help shed some weight... Turbo setup will add it back.
6. Change the ECM to a RWD/6 speed manual ecm. This will allow me to remove the TCM and assorted wiring and likely remove my cruise old school cruise module (weight savings).
7. Use the chassis for further R&D efforts for the LS4/F40 swap kit. Water manifold, accessory drive, new mount setup, etc... This will require me to convert to an electric water pump setup for a year or so, but it should also free up some additional peak hp as well.
8. Determine turbo location and make a support bracket off the transmission. This will allow me to work on the hot side and cool side plumbing for the turbo setup on my mockup LS4/F40 drivetrain.
Before I pull the engine, I am trying to schedule the car for a dyno session to get a new baseline. The local dyno is a mustang version, so while the numbers on the graph will be lower that my prior dyno, it will give me a good baseline to determine if there was the expected performance increase from the upgrades. So it will be 2-3 weeks before I start tearing the car apart...
Here is the new prototype water manifold that I am planning to use:
I already have all my rooms booked for the 2019 Hot Rod Power Tour, so that will help keep me motivated to knock these upgrades out this winter and get the car back running by summer.
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qwikgta
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JAN 07, 09:17 PM
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YES, YES, YES..... looking forward to watching you and the new mods, I'm sure that some of the new stuff will work for us AT guys too. I'm starting my LS4/AT swap soon. Got the cam/lifters/springs in a few days ago, LS6 intake and TB and latley I've been looking into exhaust. I got a set of LS7 manifolds, and they don't fit any better than the "block huggers" i got a few months ago. That HUGE trans is just in the way, may be stuck w the LS4 car headers, but I hate the merge collector on those things. Good luck and keep taking lots of pics.
Rob[This message has been edited by qwikgta (edited 01-07-2019).]
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Will
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JAN 08, 10:29 AM
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qwikgta
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JAN 08, 05:56 PM
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| quote | Originally posted by Will:
6T70E trans instead? |
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yes, still waiting on the AT swap, and if you were, the 6T70E would be a great choice, more and more of them showing up in the yards all the time.
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fieroguru
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JAN 09, 01:50 AM
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As far as auto swaps go:
4T65e-hd is easy.
4T80 has also been done, but only with the 24X engines and by converting to the 411 ecm and segment swapping in the 4L80 transmission controls. However, even then the PCM didn't control all the internal 4T80 transmission functions. Aftermarket controller is also an option.
6T70/75 - much more complicated. While I have seen GM drivetrain pictures of a 6T70 with the GM Metric bellhousing, I haven't figured out the actual application it was used in. The 4T65 was retained for most of the 60 degree pushrod engines until they were phased out. The 3.6 had the 6 speed auto, but it will have the high feature bellhousing and will not bolt directly to the LS4. Add to that all attempts to use a stock GM transmission controller for the 6 speed with the LS4 ecms (E40 & E67) haven't been successful, so you will also have to run an aftermarket transmission controller.
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Will
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JAN 09, 09:47 AM
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tampalinc
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JAN 09, 08:42 PM
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I called PCS to inquire about a controller for the 6T75 and they directed me to http://www.zerogravityperformance.com who helped with Dan86GT’s car (LS2/6T75).
Zero Gravity Performance has a standalone controller for the 6T75.
They also mentioned you can use a Gen 4 LS that came with the 6sp auto to control the 6T75 and you won’t have to use a standalone controller.
I am currently doing a Turbo LS4/4T65, but am also keeping an eye out for a good deal on a 6T75 for a future project. It looks like the LS4 isn’t the way to go if using a 6T75, unless you plan on using a stand along controller.
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fieroguru
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JAN 09, 09:32 PM
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| quote | Originally posted by Will:
Did they keep the 3800 long enough to run the 6 speed?
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The 3800 ended in 2008 and the 6T70/75 hit the market in 2006. My guess is GM didn't want to get it certified for the 3800 knowing there was only 2 years of overlap.
This is the first listing to show an actual used transmission with the metric bellhousing that i have found. So it does exist, which is very good.
https://www.ebay.com/itm/Au...5738.m4383.l4275.c10
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tampalinc
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JAN 10, 05:46 AM
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Do you know what needs to be changed to use a AWD trans in a 2WD application?
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