[AlanG]

7MGTE Weight distribution?
Hey 7mgte guys. Unexpected feature of my 7MGTE conversion is a harsh ride from the front end. My 85 had a level stance with good front struts of unknown origin. It rode and handled smoothly before. I usually run 34/32 lbs F/R but the new ride was so harsh especially over Botts dots, that I was forced to reduce to 29/28. Slightly better but the harshness is still there and there is a sense of a heavier nose. I have a Cusco front bar and a Lewitz rear bar. It looks like the extra weight of the 7MGTE and turbo bits have changed things.
1. What is the weight differential between the 5mge and the 7mgte with the turbo and intercooler stuff? This would help choose new spring rates.
2. I will experiment with combinations of no front bar, no rear bar, an LJM front bar etc. but that will take some time.
3. I also thought of measuring the front spring coil spaces in my current 7mgte, 5mgte, and 5mge for comparisons and confirmation.
4. I will try those spring firming inserts between the coils. I used to use them many years ago on real full sized American cars.
I haven’t had enough seat time yet in my 5mgte to compare, but it looks lower in front than it was before.

 

[WadeT]

Too me, it always felt like someone had just leaned/sat on the edge of the hood. It's not just the weight it's also the fact that the 7mgte sits slightly farther forward than the 5m did. On the other, hand my 6mgte feels stock.

 

[AlanG]

I came across a reference in an old posting about someone who shipped all the 7mgte addon pieces, turbo, intercooler, piping, and various etc. that said that these pieces weighed 80 lbs. Unfortunately I didn't mark or copy it.
This implies an additional 80 or more lbs over the front wheels or, worse,out in front of the wheels as with the intercooler and oil cooler. Can anyone add to this info?

How about the front spring rates compared between the MK2 and MK3 (w/ or w/o sunroof)?

 

[Supra Bob]

If you've removed your AC equipment, you'ev more than made up for the added weight of the Turbo and related bits... More than likely, you already hit the nail on he head... its that it sits further forward. Moving one pound forward of the front tires has significant effect on how a car feels... and since the 7M on the whole sits forward a bit of the 5M.. thats most likely the reason. Something for ya to try. Start the car, and remove the battery and drive it. If that helps with the feel, then get yourself a battery re-location kit (~$50 from Summit) and drop that bad boy in the trunk. Theres alot of tricks to shift weight on a car and change its handling...

 

[Junkie]

Not to stir things up,but,how do you figure the 7mgte sits farther forward :?: The trans location doesn't move,we use stock motor mount locations,etc.The engine as an assembly may be a bit longer,never really measured,but it DOES NOT sit any farther forward.


<will be out measuring the 83 and O's 84 for crank pully to core support distance,sometime today.

 

[Supra Bob]

Shawn..dunno that it does for sure.. but this is the 4th or 5th time I have heard someone say that it does.

 

[Junkie]

Like my previous post said,maybe longer,not located farther foward.Not physicaly possible,without moving motor mounts or trans.

<---- Trudges thru snow to garage-measures 5m and 7mgte blocks.

Back of block to upper rear motor mount bolt exhaust side - 12.25 inches.Same side front mm bolt to end of harmonic balancer 11.25 in.

Same measruements on both engines. :wink:

 

[Supra Bob]

Has anyone ever done any weight comparisons per wheel on a 7M conversion as compared to a 5M-GTE?

 

[Junkie]

That one ya got me on,have not seen any corner weights for either myself.
Think I'll go weigh a few parts,see if I can find enough weight to cause this.

 

[Supra Bob]

I know Dean Anderson has weighed alot fo the stuff... but never any turbo stuff to my knowledge... From my estimates tho, and using his chart, the IC and stuff about evens out with the AC stuff if ya remove all the AC.. and since the locations are similar (the turbo is just on the other side of the motor from the conpressor, and the IC same as the exchanger for the AC) the only difference is the piping...which won't be THAt much of a difference...

<--The newest Post-Ho BTW...

 

[Junkie]

Well,I figure the blocks are about the same weight as rotating assembly's,and I don't have the big of friggin scale anyway :roll:

But,I did a few other pieces.

Cyl.head,w/cams-7mgte-65 5m-70
Ex.man.-----------7mgte-17 5m-17
ct26----------------------22
Stock I/C----------------8

With misc. other crap for the conversion,I don't see a gain of anything close to 50lbs.I think BOOST is getting everyone a bit to HIGH,and they are hallucinating

 

[SupraFiend]

That was me who shipped the turbo stuff, it did weigh 80 pounds, but like shawn just pointed out, 17 of that was the exhaust manifold so its not an extra 80, more like 63 + the weight of your down pipe - the wieght difference in heads (5 pounds) then + anything you've devieated from the factory 7m setup. Like all steel IC plumbing for instance. Anyways, in the average swap or GTE conversion I'd expect at least an extra 70 pounds added to the front end. Ditching the AC and relocating the battery should get you back to about stock. The AC doesn't remove that much, I think its about 50 pounds in all. We just did this in my shop, we'll have to weigh all the bits.

 

[Junkie]

I still don't see enough to gain 50 let alone 70lbs Seamus.That's with keeping the A/C stuff.With the weights above,the differences in DP and misc induction,and electrical is minimal,I bet less than another 10lbs total.I'm seeing maybe 35-40 lbs total addition weight.Guess I 'll be weighing more stuff to compare.Good way to spend New Years eve.In the garage,supra parts and :drinking:

 

[davido]

Hi Guys, Old thread but quick question along the same lines...

Would a 5MGE and a 7MGE weigh about the same in a naturally aspirated setup?

I searched the forums and couldn't find a clear answer. I also found on Wikipedia that a 7MGE weighs 440 lbs but they didn't have a weight listing for the 5MGE. http://en.wikipedia.org/wiki/Toyota_7M-GE

Thanks for any help you can provide.

 

[williamb82]

yes, they would weigh about the same in n/a form.

 

[hawkman]

5m has heavier head..

 

[AlanG]

How much heavier?

 

[SMP7MGTE]

5m has heavier head..

No Kidding ?

How much heavier?

Uhhmmm .....

Well,I figure the blocks are about the same weight as rotating assembly's,and I don't have the big of friggin scale anyway :roll:

But,I did a few other pieces.

Cyl.head,w/cams-7mgte-65 5m-70
Ex.man.-----------7mgte-17 5m-17
ct26----------------------22
Stock I/C----------------8

With misc. other crap for the conversion,I don't see a gain of anything close to 50lbs.I think BOOST is getting everyone a bit to HIGH,and they are hallucinating

Thread reading and re-reading is beyond some peoples thought preocss ?????