Fasteddis Turbo LQ4 Build
 

Well I have sold off my 540 bbc to fund this project. 8 grand. The plan is build up the LQ4 6.0 I have. I'm running a stock bottom end. I've gapped the rings, turbo stage 3 summit cam, new pushrods, trunion upgrade on 317 heads, new ls7 lifters, head studs, elec water pump, etc.

Will be a E85 flex fuel system with a gm flex fuel sensor. Twin areomotive 340lph pumps in tank.

Tuning will be from holley efi, terminator x. It will have dual Mac valves and co2 on the gate.

Wastegate and bov are summit racing brand, look just like VS racing. 50mms.

Turbo is a VS racing s480 with a 1.25 AR T4, billet compressor wheel.

I'll be using some ebay headers and will custom make all the cold piping and hot piping.

This engine will be coupled to my TSI bolt together converter. Tsi wants me to run it as is before we make a stator change. The rest of the car is already a drag car still able to drive on the street. More then capable of handling 800-900 crank hp.

I look forward to learning more about gen 3 sbcs and holley efi. So far I'm impressed by both!


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The goal is just to run at least as fast as the 540 BBC did. Which was a best of 6.17@109mph. I don't think we'll have any problems. We want to try more no prep racing which this turbo set up will be much easier to control power on the hit.

Re: Fasteddis Turbo LQ4 Build
 

That's an awesome build your planning. I'm thinking about possibly going turbo when I'm ready to build the engine. I don't plan to go quite as wild as what you're doing, hoping to go for 550-600 whip in a car that is 99.9% street driven.

Re: Fasteddis Turbo LQ4 Build
 

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​​​thats a good goal. Im hoping that i can make my set up streatable again. Here's the progress so far. Still have to finish the new fuel lines, downpiping, mount and wire the coils and then fire it up.

Re: Fasteddis Turbo LQ4 Build
 

Looking good so far! I'm building an iron block 6.0 as well, but I'll just be running pump gas. I plan on either an S475 or 480 if I go turbo, but I may possibly go with a procharger if I find one for a decent price. I'm looking forward to seeing how your build turns out.

Re: Fasteddis Turbo LQ4 Build
 

Thanks, is your 6.0 a gen 3 or 4?

I got a gen 3 only because it was cheep, easy to find, and quite honestly it's good enough for now as I just want to have enough hp to run 5.90s in the 8th mile. That requires about 700-800 crank hp at most on my drag set up. I'm hoping that my high tq converter stall, boost tables, e85, and cam can keep the motor alive since it won't make nearly as much peak tq as a "more streatable" setup. I'm hoping to be quite mellow in the 4500-5500 rpm area so the rods don't bend so easily.

Previously this cars best was a 6.13@108mph with the 540 bbc that put out about 700 crank hp. Race weight was about 3400.

I'm going to start on pump gas but it has a flex fuel sensor and once I get the tune dialed in, I'll dump e85 in. What is cool about the holley efi is I have fuel and ignition tables set up already to compensate for changes in ethanol content. So if I want to street drive it or I'm out and can't find e85, it won't stop me from driving and having fun.

I've always went the turbo route with power adders. Overall they are less cost but can be more complex compared to a procharger.

Re: Fasteddis Turbo LQ4 Build
 

Mine is a Gen 3 block, but I picked up a brand new forged K-1 crank from a guy that decided to change his build. He was building a LSA supercharged 5.3 and got tired of chasing parts during Covid, so he bought a crate LS3 instead. As a result, he started selling off parts for the 5.3. I originally picked up the crank and LSA, but I ended up selling the LSA . It was just the blower w/ no lid or accesory drive when I bought it and I got tired of trying to put together a complete kit to probably only get 500-600 whp. I know you can get more out of the LSA, but it usually requires porting and a pulley change which seems to make IATs an issue. Basically, it seemed like a lot of money for a modest amount of power.

Anyway, I will be using the K-1 crank and a set of forged I-beams when I build the motor later this year. I know it's overkill for my goals, but since I already have the crank I'm obviuosly going to use it. I will be mocking up a possitble turbo set up to see what route I want to go in the long run. I plan on keeping A/C as this will be a street cruiser, so I will have to see what I think the engine bay will look like when I'm done. I've seen guys run A/C and both single or twins, so I know it can be done, but I will really need to see if it will work for me. I don't want to dread the thought of lifting the hood to work on it.

Re: Fasteddis Turbo LQ4 Build
 

So far the tuning has went well. Still finishing up some finishing touches. The hood exit stuff, made some teardrops, etc.

I also upgraded to a th400 fti trans. Its a stage 4 transbrake sfi bell version. The ATI th350 I had just wasn't ment for so much transbrake time. I'm very happy with the fti so far. I just hope my tsi bolt together converter does well and isn't too tight or loose. If not then a stator change will be needed $$$

I modified the umi crossmember I already had, got a 1 inch longer 32 spline slip yoke (sonnex) and the trans bolted up very nice.


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Re: Fasteddis Turbo LQ4 Build
 

Went to the track for the 1st time the other day. 1st pass sucked, but the 2nd pass I managed to launch off the transbrake at 5psig and run the 1/8 mile 95% before lifting. Keep in mind this is a "from scratch" tune. So I was a bit nervous to get the fueling, timing, and boost contol in check. But it did go well. The entire run was at 5psig. It ran a 6.73@99mph (lifted about.5 sec from the end of the 1/8 mile so mph should have been a few higher if full completion) 60 foot time was an even 1.40
This sunday we are going to give it a try again. My goal is to get a solid pass at 8-9psig on pump 93 before switching over to flex fueling.

I'm using the advanced tables to modify flow for the flex fuel sensor percentage. So I need the gas scale to be dialed in 1st.I was quite surprised at the et for 5psig on a 6.0 Ls. I don't see why lower 6s in the 1/8 mile can't be made at 10psig or so.https://cimg4.ibsrv.net/gimg/www.thi...d3776cdbc4.jpg